A great choice would be the Headstage Arrow G3, it costs about 360 and 400 with the DAC. It's very powerful and will drive most full-sized headphones with ease. It really gets my Ultrasones pro 900s to shine, which are headphones I might suggest to you. They are very good with bass and are extremely detailed. The only, situation dependant, flaw is that they have a v-shaped frequency responce curve, meaning they emphasize bass and treble, making the midrange sound a bit laid back. This is great for hip hop, electronic music but not so great for rock music. However, from experience I'll say that detail wins over emphasis, as the midrange is extremely detailed and they are very fast, which, to me is, more important than forward midrange for rock music. They can also be easily modded to bring the midrange forward, but I didn't like the effect, as it took away the crystallic detailing of the midrange and treble. Btw, if you like bass, then you can't get passed these!
P.S. A DAC is a digital to analog converter, essentially it is a usb cable that bypasses your pc's soundcard, offering a cleaner signal. It needs to be connected to an amp though.