Best used floor standers up to $1300

Magnepan MG12 or 1.6 with CROWN XLS 1500 / 2000 / 2500

Eminent Technology LFT-8b's. About the same price as Maggie 1.7's, but an easier amplifier load (8 ohms and needing less power) and a built-in 8" cone woofer that blends well with the magnetic-planar panels.

If you like acoustic music you have to go a long way to top the Rega RS-3 which is $1300 new . Shows up here once in awhile , usually around 800 bucks .

I think you'd be happy with those new Psb's or the Psb gold i's which are more than likely even better.

Honestly, thers quite a few good choices on the used side for $1200 as well. Vandersteen 2ce's, possibly Paradigm S2's with Berrylium Tweets, Monitor Gx100's, Soliloquys, Zu anything...

Peachtree is nice sounding; sweet, sparkle and punchy. It mates well with anything but I see it with Magnepan and Zu at shows.

Research a bunch of speakers and find a pair that suits your musical preference and personal tastes in sound. Your peachtree gear isn't picky so just find some speaks that you think you'd like. Take into consideration your room size and how you'll be listening (sitting down with your head in a vice-Maggies, up and around moving-Vandersteen...).

You could buy a 2nd hand pair of Infinity Renaissance 90's for that money. The Rens are incredibly, fast, transparent & have good bass when paired with a strong ss amp (atleast 200 watts, or lower wattage with low loss, high current and a high damping factor). The Rens almost sound like dipoles & have great imaging. Sound staging is also impressive with excellent off-axis performance. Though they are getting a bit old, so you need to check the condition of the foam for the transmission line midrange at the back of the speaker as some examples have crumbling foam. Also, the grille which is an integral part of the sound needs to be in good condition with undamaged pegs & cloth. But if you can tick all those boxes & find a good, original example they are a mega baragin at their price point.