Looks like an excellent gaming rig, Prole. The I7 is probably overkill, but it does give you the option of swapping out for a more current processor somewhere down the line, which is a good thing.

The only thing I would consider is a second hard drive. I love having a storage drive, and as Kukri correctly points out, HDs in external enclosures have a high failure rate. Dunno why, but they do. I would imagine that tossing another 500 gig or 1 terabyte HD for storage and backup wouldn't break the bank.