Hi, I was wondering if anyone can help me with pricing my machine well and where is a good place to sell? It's 2.5Ghz PPC QUAD G5. 5GB DDR2 SDRAM. (4 slots still empty) 500GB Hitachi 16MB cache 7200RPM Harddrive. GeForce 7800GT 256MB Video Card. (optional at the time of purchase) Built in Wi-Fi antenna (optional at the time of purchase) Serious answers only please. Thanks!