Scan actually sell a single DVI card for about £10 which will tide you over.
EDIT:
Computer hardware and software at amazing prices, available online from Scan Computers UK here is the link.. useful little spare if anything goes wrong
I would certainly wiat for the new ATi card as it sounds as if it will be better than the GTX by some way and be around the same price
Otherwise thats almost exactly what I would build, I wouldn't let anything HP in my PC though.. yuck!!