I think these were the ones you couldn't fit them for sli.......
I'll be getting this Gigabyte GA-Z68X-UD3H-B3 http://www.gigabyte.com/fileupload/product/2/3853/4276_big.jpg
which appears to have 2 slots between the x16 and x8 slot.
I'd either get that case or a Graphite 600T, but it's pretty expensive. I was going to consider water cooling them but I couldn't trust my self to remove the heat sinks and void the warranty on $500 worth of cards haha. At least they sound like they'll stay pretty cool, given adequate air flow.