im wanting to upgrade my gateway fx400 to the x58 motherboard, i7 processor and geforce gtx 295 video card. will i be able to replace just those 3 things? will the computer's case allow the components to keep cool? im sure i will need to buy a more powerful power supply and some better type of cooling device. what else do i need to know? ive never done anything like this before. any suggestions on the power supply wattage i need? is 700 sufficient? what type of cooling devices should i get? your help is GREATLY appreciated.