Building an all analog system around Magnepan .7 for 4K and under

It sounds like you have not yet bought speakers....
Magneplanar may still have their loaner (return) program going for the 1.7i speakers.  A classical musician and jazz drummer combo sounds like you must live in a fairly large city, so your Maggie dealer should set this up for you.  Dunno if they do it for 0.7's, but there is no such program for the 3.7's (I wanted to try those to replace my 1.5QRs).

BTW, a larger physical speaker does not mean the speaker is also larger in an acoustical sense.  I called Magneplanar and Mr. Maggie (Wendell) told me the 3.7i speakers were acoustically smaller than the 1.7i.  You should call them up and talk to Wendell about exactly which speaker would be best.

Maggies are perfect for your source material.  They want you to use the DWMs and not dynamic subs (many do this, but they are difficult to integrate with panels).  The DWMs can be made to look like coffee tables but need ot be at the same distance from your ear as the other panels.

I see this thread going into room treatments... so you may as well post a photo of your room in the section for that...

We've owned the .7's for more than a year and a half powered by Rogue Cronus Magnum (100 wpc) and also using a powered sub (sealed SVS SB1600), a modest pro-ject 1xpression turntable and pro-ject phono stage in a similar sized room and feel like whole exceeds the sum of the parts.  Have also had them hooked up to my vintage SS receivers (a G-8000 and KR-9050).  I prefer the tube sound personally with the vinyl though the SS sounds "tighter". Not sure the extra watts of the old receivers adds much in our smaller room but that's personal preference too. 

The mags do sound better with some room to breath but their light and slide easily so we pull them out when we're listening and push them back to the wall when we're not so they're out of the way and don't get trampled by the dogs or the kids. 

I have Maggie 1.7s. I went from a Rogue Cronus Magnum to a Rogue Pharaoh. As good as the Magnum is, the Pharaoh was far & away better. Then I went from the Pharaoh to a Prima Luna Dialouge Premium. Once again, the Prima Luna was a significant improvement across everything. I have a Nad 375bee coming to drive my home theater speakers (in the same room) and serve as a back up to drive the 1.7s. I will let you know the synergy. Note: I also use a sub in the system. I was using a Rel t7 sub, but it fried a diode. While it's down & I get around to ordering parts, I put in a PSB subwoofer. I'll be honest. I like the PSB much better... just sounds better. Go figure.

I just auditioned .7s with the Sphinx and the NAD C368 at my local dealer.  I also listen primarily to classical, jazz and acoustic. The NAD was much brighter, too much so for my taste, so I went with the Sphinx. The Maggies have enough bass for me, and I've still never heard a speaker that reproduces a violin or piano or voice like they do.  The equipment hasn't arrived yet, but I will be using it with a Pro-Ject Debut Carbon with Ortofon 2M Red cartridge and Blue Jeans cables in a 14x17 room. You could certainly step up to a Rega TT and suitable cartridge and make your budget.

One should not overlook a really good analog TT/TA setup that is somewhat new. Check out the following: 
The PolyTable SUPER 12 http://hifigem.com/PolyTableSUPER12.html
George Merrill has been making TT's since 1979 and this model is getting rave reviews. Easily besting TT's selling for $10K.
Best of luck