So I've been debating on whether or not to purchase a mac pro. Granted, I will be purchasing this used, I decided to look around online and I stumbled on this ad on Craigslist near my area. 2.7 Ghz. processor 2 gigs of ram 8 ram slots, expandable to16 gigs 400 Gig 7200 RPM Fast Hard Drive Room for another full size 3.5" SATA Hard Drive inside tower Dual Layer SuperDrive, burns everything Dual DVI Video card, can run 2 monitors at once USB 2.0 ports x3 Firewire 400 port x2 Firewire 800 port x1 10/100/1000 BaseT Ethernet Sound in port Sound out port And the price: only 200$. My question is, is this a good bargain? Are Mac Pro's easy to upgrade, and what would I be looking at upgrading? And how much would these upgrades cost to be running parallel to a Mac pro that is a year or two old?