Best speaker 3k to 4k used?

Dynaudio Contour 3.3 or Silverline La Folia. Dynaudio probably has better integration, but Silverline will go deeper and probably has better midrange.

Third recommendation for Aerials - for your amp and listening tastes the model 6's would be perfect (yes, I use them too..). I use a 100 w/ch Rowland integrated - the combination is fantastic. I use them even in a decent sized room (21 X 13) and only need to turn on my REL Storm for heavy classical/organ music. Try to find a similar 3-way speaker (the key word, 3-way), with trickle down technology (same tweeter as 10t) and this level of build quality, for the price of the model 6. I have yet to hear a speaker under 5k that sounds better overall... It certainly is one of the best values (used) in high end...

A pair of Gershman Acoustics Avant Garde RX-20 (demoed or used). Read rave reviews in the press.