Thats your best choice man, i recommend getting a 1MB cache AMD64 cpu also. Those san deigo's will OC really good, i had a problem with a 400mhz increase on my clawhammer. I dont see that for the san deigo's though.
I was totally thinking of welding together two cases like that as well. Would make more sense than buying it for $250... Or would it? Who knows. Have fun, and keep us informed!