using a pair of audiotechica ck7 now. sounds good so far even without amp. =)
Well, if bass is what you are looking for, you can try the Beyedynamic DTX-50. Thats what I'm using now, and the bass is . I feel that the bass is more shiok than the UE SuperFi5eb that I had tried. Big fast thumping bass is what the DTX-50 is about. I think you should be able to get it for less than $150. Jaben is having a promotion now, check them out.
Canon 650D|Panasonic LX3 / LX5
50mm f/1.8 | 85mm f/1.8 | 12-24mm f/4 | 28-75mm f/2.8