Right, so am I. I guess I wasn't specific when I said watercooling. If you decide to use something like the H100, it looks like you have to give up the top exhaust to cool the CPU. That just leaves you with possibly a front intake, that's in front of the PSU (yuk) and the rear exhaust. You end up having to rely on the graphics card's own fan for pretty much all of its cooling needs. You also still can't fit two cards in the M if you go that route.
Currently looking into the Corsair 350d. Even though the 800d that I have needed to have some modifications for better cooling, and it ended up with some acoustic issues, the case was extremely easy to work with, and I really just want a case that's at least half the size (thing is HUGE and it's not even their largest case). It's also relatively quiet for the amount of fans and placement. I love the looks of the Prodigy line, yet from everything I'm reading so far, the Corsair 350d beats it in terms of flexibility, and in most cases cooling (not by that much though) and both are almost equal for noise.