i'd like to get one radiator to cool the CPU, and both graphics cards. also, i'd really like to keep them all internal, so i can pick the case up and go.
i'm thinking maybe i should just stick to an EXTREMELY well air-cooled system though... one i can still overclock with.
only reason i don't want to do water-cooled on this case, is i will be moving it a lot (taking it to LANs, etc.), and it's going to be moved around, placed on its side, etc.
Other than the res (you CAN run a res-free system, but it'll be much more difficult to fill and ensure that there are no air pockets and no risk of anything running dry), everything else should be fine. Perhaps you're more interested in a mini-ITX or micro-ATX system? There are quite a few HTPC and LAN party chassis out there; Silverstone makes a few nice ones. If you have a rough cube that's not much wider than it is tall, there'd really only be one position to put it in. Other than that, there's some like the Antec Mini-P180 to consider, though that's not much smaller than a regular ATX chassis (added an inch or two to height by making it easier to work in). Micro-ATX may be your best fit, however. The DFI Jr T3HE6 would cover your X58 front and of course gives a pair of PCI-E x16 slots for you to have fun filling. Combine that with a cube mATX chassis and you're mobile and can use a full-sized (or sometimes even oversized) power supply. For those smaller systems, a Corsair 650TX should provide enough power in a small enough package. They're a good bit physically smaller than a 750TX. Other than that, you can see about an MSI or Asus mATX motherboard for that sort of LAN system...

As pointed out before, almost any (decent) X58 board can overclock and supports lots. That's the nice thing about the "high-end" boards... multiple graphics slots as well as a few added features. If you plan on going with a compact system, I'd say you should pay the extra for extra features. If you will want, need, or ever really use 1394 Firewire, buy a board with those connectors and perhaps a front-panel 1394 too. Make sure you've enough USB and enough eSATA. Use USB when in doubt!

You'll run out of slots quickly with double-slot graphics cards.