I need some recommendations for new speakers based on a room size of roughly 10' x 15' with an 8' ceiling (basically an extra bedroom). My current setup is listed below, I am happy with the Klipsch Heresys but they are severely lacking in the low-end. I think they are great for listening to classic rock, indie-rock, and country but for jazz they come off as a bit nasally (esp. with the horn instruments, it seems to amplify the effect). I also listen to quite a bit of electronic music from techno/trance (hard driving beats around 120-145 bpm) to the more "intelligent" type such as Aphex Twin, Boards of Canada, etc.

I listen to rock/indie about 50% of the time, electronic about 30%, country (mainly alternative and Texas artists like Lucinda Williams and Robert Earl Keen) 10% and jazz 10% (but increasing). I have heard B&W speakers but my amp is only 50 wpc so I would really like something as efficient as the Klipsch. I know I could add a small sub (8"/10") but space is already at a premium and I would like to keep it at two speakers.

Any recommendations are appreciated.