I am wondering what peoples experiences with these models are. Are they worth $1200 in good condition. Main use would be rendering in Carrara Pro 8. MACPRO A1186 - 2 QUAD CORE 2.8GHz (8 CORES) 4GB RAM 320GB HD. I have seen several of these lately and wonder about upgrades, issues, etc. Ram on OWC does not seem to bad in price.