I would strongly suggest borrowing someone's similar rig and seeing for yourself, before blowing all that cash. Plenty of people would love to see their machine 5boxing wow that want bragging rights. You will save quiet a bit of cash.

Also if there is no reason to fill out an entire PO I wouldn't. Get the gear you feel you really need and then the 'undecided' gear cannibalize or borrow to test drive.

With the way people burn through gear, you can get a graphics card of a kid pretty quick.