Although I love my 13" MBP I've been wanting something more powerful and stationary for my development work. The mass of cables and USB hubs required to get a good setup going while in clamshell mode is driving myself and the missus crazy (the beautiful array of cables is a mess apparently). So with a limited budget I've taken the plunge on a 3,1 on eBay for £225. It's the 2 x Quad Core model with 10GB Ram and it's still sporting the stock XT 2600. What I'd like to know is what sort of things I should be checking up on when it arrives? The seller says it's in good condition but we all know what that can mean sometimes. I'd like to make sure it's got at least another year left in it so any common failure points/ dust traps would be good to know. Would new heatsink paste on the CPU's be a benefit? As for performance I have a spare GTX 650 to go in it...I'm assuming that it'll work ok? Lastly, is there any penalty for running odd combos of ram in a MP? I have no idea how the 10GB total has been achieved. Any other useful hints and tips would be much appreciated.