Montana KAS's. I traded them in for the WAS's, which I love even more, but I sure wish I could have kept both -- the KAS's in the bedroom would have been sweet overkill. On second thought, I just remembered Sean's comment above and I'm not sure I could afford to build a second system! One is more than enough to keep me busy. Still ... that sure would have been great. Maybe I'll have to find something more compact.
Speakers you regret selling
I was lucky to own Sonus Faber Extrema, Acoustic Energy AE1 Signature, and Dynaudio Confidence 5 in the past. They are rare in used market and can make any owner happy for the rest of his/her life. So I swore to myself I would never sell my Sonus Faber Amati this time though my wife has heard that a million times. What did you regret selling?