Dorm Room Amp/Preamp

Hi, I'm a budding audiophile about to go to college and leave behind my Paradigm Reference Studio 60s so I originally bought a used pair of Paradigm Monitor 3s and a NuForce Icon after seeing the glowing review of it in stereophile. The NuForce was too much trouble with the rj45 to speaker wire connector and new power supply so I returned it. I have about $800 left to spend on amp/preamp. Any suggestions on what to buy? I obviously don't need a lot of wattage and something with USB in would be nice. Thanks for your help.