Best speaker in the $4-6k range.

What Krell electronics are you using?

Dynaudio is a very nice match with Krell. I haven't heard the new Contour series (just released), but have the 3.0's paired with an FPB-200c in my system. Your room is just a hair bigger than mine and has an open wall, so you might prefer the 3.3's. You might also look at a pair of the 25th Anniversary SE monitors - they're about $5500 with the stands and are outstanding.

Kthomas, I am running a KCT and a KAV 250p. I am also using a Marantz SA-14 for my front end.

I hate to say, I recently bought a pair of Krell 350M's to push the Nautilus 801's I have. VERY bad combo, the B&W's actually sound quite bad. I kept the amps in line, swaped out to the Energy Veritas 1.8s, and big difference, a nice improvement. Now, I am still not mad about the Krell amps!
I am using a Cal Audio MCA-2500 which is phenomenal in 2 channel for a 5 channel amp!! I am selling the 350M's and am going to try the McIntosh MC-1000's. If they don't do the trick, away they go, away the 801's go, and back to ole' faithful, the MCA-2500 with the Veritas 1.8s!

Stehno is right, Aerial 10Ts, Energy Veritas 2.8 (or 1.8) are the best speaker, IMO, shy of the Dunlavy SC-IV.

Dan

Harbeth Monitor 40s around $4.5k used, here at Audiogon.
Vienna Acoustics Strauss (the model slightly smaller than the Mahler). Vandersteen 3s. All brilliant, all non-fatiguing. Or toss the SS amp and switch to tubes.

Sonus Faber pairs well with Krell. I've seen used Extrema's on this site in that price range, they would sound great.