Selling 4 x Dell Precision T3500's. Specs:
Quad core Xeon 2.8 GHz, Quadro FX1800 graphics card, 2TB Hard Drive, Vista Business OS (64 bit or 32 bit), 6GB of RAM (triplets--additional triple slot open), 16X DVD +/- RW w/dbl layer write, 2 years of original warranty (transferrable). $600 each. Sell with or without two 24" 1920x1080 monitors (for additional $120 each).
Light studio use, spent their lives mainly unplugged in a corner, lonely and waiting for someone to push pixels through their busses...