Well, I know some are fear ebay for high end IEMs.... But a couple of year ago I picked up my Shure SE530s on ebay for about $280. Just made sure it was a reputable sell with good feed back. I've been very happy with them... they sound great! You may find some SE530 for a price that's close to you budget.
A few days ago I picked up some Klipsch S4s ($80 @ Best Buy) amd some Denon AH-C560Rs ($50 on sale @ Best Buy usually $99.99). The S4s sound good but not in the same league as the SE530s. The Denon's were a pleasent surprise to me. They sounded better to the S4's to my ears. Again the Denon's don't have the detail or sparkel of SE530, but still good. The Denon even seem to have a bit more bass present in some music than the SE530's.
The SE530 are great, and I try and find them for the right price if I were you. If that's not possible consider trying the Denon AH-C6560R. My expierence is limited to the SE530, AH-C560R and the S4's. So I can only speak to those.
Good luck!