What to do about speakers?


I'm afraid this is another one of those "I'm building my first system and don't know a thing about how to do it - Please help" threads.
But seriously, after thinking about it and casualy scouting equipment for a few years I've finally started to build my first "real" system.
A little background first. (sit back and get comfortable this may take a bit) My wife plays the cello (not professionaly) and her father was an audio tech. with CBC Radio for years before he moved up to management and recently retired; so she has a well trained ear and enjoys good sound. I, on the other hand, do not have ears quite as well trained but am completely in love with music and enjoy hearing the little details.
That being said, we are just starting out (married only 2 years, she in grad-school me going into teachers collage) and so are not about to drop $??000.00 on speakers or the like.
Now for the meaty stuff.- I recently purchased my first piece of audiophillia technica - namely the much touted Rega Planar 3 turntable (yes he said P-L-A-N-A-R-3, not P3- it was the right price) and I'm running it with a dennon DL160 Cart. Yes, yes I know the speakers should have come first. But you see I've wanted the Rega for about 8 years now since I first saw one, so when I decided to start building my system I just couldn't ressit starting with it. Unfortunately this TT is being amplified by a (now grab a pillow to muffle your screams of abject horror) Marantz 2215 b integrated amp/tuner and, even worse, the speakers are from my highschool days and came with some cheap system I puchased at Sears. Before christmas (when I bought the Rega) I was using a pair of JBL-L112's but unfortunately they were not to surrvive the trip to the in-law's over the hollidays.)
So as I can no longer stand these speakers I am looking for replacements. My wife and I are currently renting and will probably do a fair bit moving around over the next 5-7 years so fitting the speakers to the room this system is in doesn't make much sense; suffice it to say it will be in the average sized living room of whatever average sized house we wil be living our average sized lives in. As far as price range we are looking in the $500-$700 range. I've done some reaserch, but must admit I'm quite baffled by all the speaker-tech that I come across .
I was thinking that a set of full range speakers was what I was looking for but then I realized that I don't know what the differance is between: Full Range, 2 channel, centre channel etc. is. So why would one purchase say a two channel speaker over a full range speaker?
I've been told(by my father-in-law and my hi-fi freak uncle) that the JBL S38 model would suit what I'm looking for, however, I thought maybe something like the Mission 701, or 761 series might be better but I really haven't the fainest, any help would be greatly appriciated.
Oh as for musical tastes, well as both my wife and I will be using the system say everything from the Beatles to Bartok, or the Smiths to Satie, or even Coltrane to Mahler.(Copeland to Guided by voices Anyone?)
And yes the amp will be next -but that's another forum.
Sorry for the ridiculosly long post and thanks to anyone who actualy read all of it. Thanks also in advance for your wonderfully witty, insightful, and incredibly helpful responses.
P.S. sory for any typeos:< ( oh And for anyone wondering It should be pronounced CHAS- when I registered it the name was taken so I had to be creative - ug!
Cheers.

tchas
Just curious..Does your wife have any opinion about what would make a good speaker? I get the impression that this will be a system you will share. I also got the impression that she has got good ears- that you respect her observations about sound. I think that makes you fortunate. Is she much interested in this system building endeaver? I would have thought the NHT speakers would make a good all rounder for your Marantz- a good compromise.
Second the Athena's. Easy to drive and great with all types of music. Some might find them a little bright with certain equipment, but should match well with the Marantz and Rega. Only thing to keep in mind is that they are fairly large. They have a big dynamic sound, but somehow seem to me more coherent and organic than a lot of other speakers I have owned.
Tim:

The NHT's are excellent speakers (the SB2's are superb), but because of their acoustic suspension design that are a bit power hungry (85db sensitivity). When I had them hooked up to the Marantz 2216B (16 wpc at 8 ohms), I would be at the 11AM position on the volume control to get them a bit loud and that was in a bedroom system ... in a decent sized living room, it would be pushing Chas' Marantz 2215 most of the time.

Let's keep this interesting, given that we are talking about a seriously retro system ... vintage Marantz receiver and turntable.

Another way to go could be something like the "Silent Speakers" from Direct Acoustics . Direct Acoustics is run by Winslow Burhoe, one of the founding fathers (or uncles) of modern speakers. He was part of Acoustic Research in the late 60's/early 70's and went on to start up EPI speakers ... fyi ... growing up in the 70's, just about everyone owned a pair of EPI 100's at some point paired with a receiver. These speakers have some interesting design science behind them and they could work out pretty well.

Regards, Rich
Well I must say that after checking out the provided links the Athenas, Europas, Silents, and 301's are the ones that we will probably be focussing on. Yes I said WE Timf, Jessica, my lovely wife, will be involved in building, using this system; and yes you read correctly she has very well trained ears, and I respect her observations about sound and oh so many other things! [ she's probably going to see this post:)]She has good ears but doesn't care much for reading reviews, doing research and the like, for her it's all about listening, and how components sound. So my job is to do the research and come up with a short list for us to audition then we chat a-bit and decide on which one we will get.

We were both thinking that when we eventually replace the Marantz we will probably go with a good tube amp.

Thanks for all your help folks. I'll let you know how things go.
Along the same lines as the SB2, I can recommend the Epos ELS-3. They 87db and 4 ohms, so they should be okay with your Marantz, and they are outstanding in my 12x12 listening room. Surprisingly smooth high end for an aluminum tweeter, and very tight bass down to 55 hz or so, which is all this room can handle anyway. Very simple crossover so mids are clean and phased well. You can buy them used here on Audiogon just about anytime for around $225.

David