How about the new Coincident Partial Eclipse ($3000) or Victory ($4600, 97 dB, 14 ohms!) or even Conquest ($1900): coincidentspeaker.com. I'd also bet your Atma-sphere would be killer with the new Green Mountain 1.5 ($4800).
Small footprint speakers
I am curently using an Atma-sphere set-up (MP-3 preamp and M60-Mk2.2 <60+ watt monoblocks> driving Rogers LS3/5a's(B.B.C. monitors) with their AB-1 passive subs. I need a SMALL footprint (width and depth), higher impedence (8 or more ohms) speaker having unpowered bass drivers. I listen primarily to WELL produced (yes, it does exist!) and pressed rock and pop and some jazz. Listening room is medium size very well damped (acoustically dead) and I don't usually listen at "headbanger" levels. What I'm looking for is: more bass (down to 30-35 hertz), better 3-D depth of soundstage, a little more "slam" while still maintaining the increadible sweetness and warmth of the Rogers' mid-range. Thanks!