Seriously, dude - Menty and I went through a parts list that totaled $450.00US, and my PC kicks some serious booty.
The only tricky part is that durn assembly, but there's no reason you couldn't do it - it's suprisingly simple when you sit down with all the parts in order.
Unpack parts (easy).
Grab the brass motherboard screws and screw 'em into the case.
Grab the motherboard and set it on top of the brass screws.
Screw in the motherboard (sexy sounding, but not).
Plop your processor in the motherboard.
Plop your processor fan on the processor and connect the fan to the motherboard.
Snap your RAM in to its slots.
Snap your video card into its slot.
Throw your hard drive into the case and attach power and data cables.
Throw your optical drive into the case and attach power and data cables.
Attach the rest of the power cables.
Attach the front panel connectors to the motherboard.
Connect any other fans to power.
Close up the case and GET READY FOR SOME UNBRIDLED PC POWER!!!
I've built seven PCs now, some for me, some for customers, but Menty's got the numbers to beat mine - I'm sure there are several hundred PCs with the Menty flair on 'em. Between the two of us, we could really burn some shit down.
Unless... I could talk you into a Mac...