This would be my first suggestion at that price point: Corsair Carbide 200R
http://www.corsair.com/en-us/carbide-series-200r-compact-atx-case
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4907301&CatId=1509
I have a Asus Z87 Sabertooth mobo. It has 1-X16 PCIe slot, if I use the second slot they both become 2-X8 slots. I'm looking to upgrade my GPU. My qurstion is: 2- GTX 770 in SLI both @ X8 or 1- GTX 780ti @ X16 ?