It's a Corsair 800D case, but I did some case mods on it to fit a 240 push/pull rad on the bottom, and modified the top for push/pull fan configuration on the 360 rad. It's a very popular case for water-cooling (maybe a little to popular). I have more pics of it on my build thread if you want to see more angles of the case.
I bought it on Ebay for $20-25. It's a Tanzency Hub, just search for "macbook hub" on Ebay and you'll find it on the first page. I didn't expect much, just thought it'd look cool, but actually it's a pretty sturdy and solid quality, very much worth the money.