Well, you could also go the easy route (though a tad more expensive) and get a Koolance tower. People seem to like them, and the tower and full tower versions are Antec (or Chieftec, etc.) cases, so they are good quality. Again, they are pricey ($269 for the server case ($150 for the mid-tower case), tubing, pumps, radiator, and water), and you still need the CPU waterblock ($30-50), a powersupply($50-100), and any other waterblocks you want for the chipset, videocard, HDD, etc. In all, you might be looking at a system that costs you $400+ for just the case and H2O cooling. It's not bad, though, if you like the quiet. HardOCP and Overclockers.com have reviews of the mid-tower version, which isn't the prettiest case, but it works.
I would stick to the CPU-only setup, though adding a video card cooler would work well, since there is no basic case cooling. The mid-tower has a place for a rear 80mm fan, and it looks like the server cases have mounts for two rear fans (the two front mounts were removed to fit the reservoir). In all, not a bad looking little system if you don't want to do through the trouble of setting up your own system.
-SammyBoy