As you can see from my profile, I have an i7-990x, and I was looking around for my friend to see what kind of system he could put together that would perform well but not kill his wallet.
I looked at the likes of the 965x but then looked at the cost - and availability - of motherboards and it was pretty scarce (and expensive).
Going with an I7-980x and an x58 motherboard you would have to forgo a lot of the goodies (or pay quite a lot extra) to get the USB3 and SATA III ports you will want.
So if I were you I would forget the idea of getting a 980x.
You will be better off going for something like a 4770k
CoolerMaster HAF X, i7-990x, Gigabyte X58A-UD3R, 24GB Corsair XMS, Sapphire 7950 Vapor-X, Corsair Neutron 128GB, 3*Seagate HD (3TB), Seagate HD (1.5TB), Hitachi HD (2TB), Plextor DVD + BluRay, StorageWorks DAT 72, 29160 SCSI Adapter, Corsair H80