Here are two contenders and my experiences with them in different rooms with very different acoustics:
PSB Imagine T6: Clean music, good imaging, clear mids and just right highs. Adequate bass for most songs, but lacking in Rock & Techno (thats what i hear most)
KEF Q700 (I couldn't find Q900 to audition yet): Superb imaging and sound stage, horribly sounding bass, clear mids, warm highs which i tend to like.
I can add woofer later but Q700's ugly bass turns me down and I won't be able to ignore it. I guess Q900 would do better with bass with those 8" drivers.
Anyone auditioned Q900 & T6?