I just rebuilt my main rig (DFI nF3 250Gb/ 754 Venice 3000) with a DFI "Expert" board and AMD X2 3800 CPU.
I might use the "good ol' horse", which ran at 2600 for 2 years, as a "folder" or something...
I notice half of these replies haven't even considered the equipment in your sig - a DFI nF4 is a full-sized ATX board!
I'd suggest any of the mid-sized Lian-Li's, P60 series or the newer models. superb build quality, quiet looks, good cooling. I have a PC-65b, and it's on it's 5th iteration...