I know I probably sound like a bit of an idiot here (I'm not extremely familiar with the PSU and motherboard relationship), but does it matter what I kind of PSU I buy to hook up to my Motherboard? Are there specific types?
I ask this because I'm going to upgrade my GPU, but my PSU isn't capable.
PSU's are fairly standardized as ATX but not all PSU's are created equal - there are some terrible beasts out there masquarading as PSU's (and even have very attractive packaging). What graphics card are you looking to add, that will have a lot to do with the PSU you'll need.