Bookshelf speakers with the good bass.

Check out Fritz (www.fritzspeakers.com). You can read some reviews on Affordable Audio as well as a recent review at http://www.polkaudio.com/forums/showthread.php?t=99646.

-Tim

So with no mention of amplification, I feel the recommendations are a bit blind. Perhaps you've great amplification, but if not, improved will aid in structure and depth. Also, your source and cabling all influence. Massed stands?

I've listened to this speaker through a friend's electronics, CEC 2000 highly modified, custom tube DAC, custom preamp and VTL 60wpr triode monoblocks and they sang with plenty of bass in a room 30X20X12. Actually thought they sounded a bit congested in the midrange.

But, perhaps the suggestions are legitimate for your needs.

Dynaudio Acoustics BM15P is the passive model. Lot of on-line Pro sites should have it. It is an excellent speaker.
I owned a pair for about six months and used them with a Manley Stingray. Brand new pair 1100-1300 range.

Totem Mani-2s have excellent bass ((to ~30Hz) and sound great top to bottom. You need lots of power for them though.

Phase Tech makes some of the most amazing small speakers I've heard. They have great bass and they are inexpensive. Look at the PC 1.5s.