I found your discussion while searching for a slim ATX case myself. If you're still looking for one, here's one I found coming out this February....
www(dot)lian-li(dot)com/en/dt_portfolio/pc-o7s
P.S. I don't yet know if there will be room enough to fit a 2nd card in SLI. Also, apparently I can't submit a link until I've posted a few times.