If you want to hear impactful, rumble-filled bass, the gr07s won't quite cut it for you. I listen to hip hop and a little bit of older rock. They're perfect for rock, and they're great for hip hop, too...but sometimes I want the hard-hitting bass. The clarity on these are unbelievable. If your music is in 320kbps, you'll probably hear sounds that you've never heard on your old IEMs. I probably won't be spending this much on IEMs again, though, since I'm just a student. It was money well-spent, though.
edit: If you widen your budget an extra $30, I don't think you'll be disappointed with the gr07. Headfi loves them, and I've never found negativity typed about these. I've even google searched "gr07 sucks" and "gr07 overrated," yet I still can't find anything bad about them. I usually look for negative reviews on every big purchase I make, since I think that sometimes people can be prone to justifying their money spent, and would hate to think that they wasted money. Don't get me wrong, I check out positive reviews, too. But, I'm more interested in the negative reviews (weird, I know).
Edited by Longtime Lurker - 6/3/13 at 6:09pm