Best speaker 3k to 4k used?

I would think you'd be hard pressed to find a better used speaker than the Aerial 10T. Sonics, appearance, and fit'n finish are second to none for anything near the price range you mention.

However, a high-powered amp is pretty much a requirement for the 10T. I'm now on my forth or fifth amp in the last two years and I am more than impressed with the full range sonics of the 10T.

-IME

Try soliloquy 6.5. Agree with the Martin Logan suggestion as well. Avoid speakers from companies going out of business. Also Silverline does not extend warranty to second owner, had bad experience with the finish and no viable recourse. Best bet is to get warranty coverage.

Von Schweikert VR 4.5's

Apogee Diva!!

I too would recommend the Aerial 10T, which I believe continues to be one of the best buys available and pretty easy to find in the upper end of your price range in excellent condition. Unless you have a very large room you do not need a high powered amp to enjoy these speakers, but the minimum recommendation is generally 100 watts per channel. I used a single BEL 1001 MK3A, which is 50 watts per channel for a year or more and was very satisfied considering I traded up from a Classe CA300. Today I use two of the BELs bridged mono (200 watts)in a 13X22 room and that is all the power they need in a room of that size.