If the case is up in the air then you have a first consideration: do you want it all internal or some external? If you want internal, check out
this thread. It has a list links to pictures of different cases and how they fit the hardware in there.
Then figure out a rough budget, if the case is included and you are aiming for continuing with watercooling, I recommend something that can accommodate a triple and a dual minimum. If you aren't cooling the videocards a single triple is enough usually(depending on your OC aims).
Simply for ease of use I would pick up the Silverstone TJ07 or one of the Lian Li's with the bottom hdd storage area to be used for rads. If you want to fork out a bit more cash you can't get much easier than Mountain Mods cases, the Pinnacle 18 can hold a stupid amount of cooling hardware and is the standard case shape.
Edit: That pump is a lot of flash for no substance. The performance of the top used on it(koolance) is behind the Ek Rev2 and the Detroit tops that are offered for a mere $40 at PPC and Ebay(Detroit tops). Plus you can buy that black sparkle bling addon separate if you really feel the need, but I would caution you to spend your money on your first WCing project on solid, good performing and necessary items that will outlast your current hardware so you don't need to replace your system entirely next time you want to upgrade your machine.