Bedroom system for my 10 year old son

We're re-doing our 10 yr old son's bedroom. He's really into music, listens either to his iPod or the family computer in the den. My wife says we should add a stereo for him. I've got a pair of NHT Super Zero's sitting unused that I can throw in there. What I need is either an integrated amp or receiver. I prefer something in the sub $200 range, preferably with a headphone jack. Because he doesn't have much shelf space, the smaller the footprint the better.

Any recommendation for something that would work with the NHT's? Would I be better off spending a couple hundreds of bucks on a shelf system?

Thanks in advance.