700.00 speakers new or used

At that price point, I have a couple recommendations.  The KEF loudspeakers from the late 1970s are wonderful.  The tweeter they used back then got used by a lot of people and was certainly one of the very best of the day.   A buddy of mine runs a pair of the KEF Calinda being driven by a Marantz 8B power amp and it's just magical.  The Calinda can be had for about $500 and the bigger Cantata for $700 or less.   

Here's a link to a Cantata pair for $650.


Another speaker I think is a terrific value in this price range is the floor standing Thiel line.   You'll readily find the CS 2.2 for $700 or less.  Very natural with excellent detail.  They sold for much, much more than that when new and worth it then.

Too bad there aren't more apogee duetta or signatures out there, you can listen to them all day and get better bass than the maggie's.

Umm Klipsch RP-600’s - uh NO!

Why not Klipsch RP-600m?

I'd look for a second (or 3rd or 4th) hand Klipsch Heresy, Forte, or Quartets.  At some point you might want to replace the crossovers and consider swapping out the tweeter.  Bob Crites is a great source for aftermarket parts and there are others.  There are some other inexpensive mods you can do to make them sound better like damping the baskets with Dynamat.  I think that would be a much better value than their newer cheapo stand mounts.