I'd advise getting a noctua d15 than an AIO water cooler.
Not only cheaper but it will be much quieter and cooler than any non custom water cooling.
Your spec is great but I'd get the noctua d15, and the define s or any of those phanteks are good cases too.
I do prefer the define s because of the open front so the fans can blow air unobstructed, great little cheap case.
The define s has no optical bays btw in case you didn't notice but who needs a dvd drive these days.
I would say though long term if you plan on sli /xfire might be better off with a more roomy case, smaller cases are more suited to 1 card setups imo.
You get what you pay for and you wont get hq in cheaper cases.