Best speakers in the 3000 -5000 range

If your amp doubles in wattage (or close to it)at 4 ohms vs.8 ohms, then it has enough current to drive Magnepans. The entire line sounds more like a concert stage than any box speaker and are very tweakable. This is a good time to get 1.6's or 3.6's used since the 1.7's and 3.7's just came out and many Maggie lovers have upgraded.

Dali Euphonia MS4

If you don't have the space or power for maggies (which I agree are nice) you might want to consider Harbeth C7's or HL5's. Just depends on your personal tastes and situation.

I'm a big Harbeth fan.

I bought (and sold) a pair of the original revel studios for $4000. You'll be hard pressed to find anything better for that price used.

I like my PSB Golds, but I have found most PSBs to perform well above their price point. Their best is the Synchrony One.