That'd be the best solution probably.
Well...alienware cases are mostly for looks. Too much plastic for me and the moving vents are excessive, totally unnecessary.
Personally, I'd just build a computer from scratch if you don't like any of the nonalienware cases from online builders. I'm pretty sure that the computer board will be more than enough to get you through, if you've never done it before.
One case that has gotten me all wet is the Silverstone Fortress case: FT02. Vertical mobo setup so that hot air rises. It is pretty much PERFECT for cooling. It has all the extra luxuries of other cases too, like a window, tooless design, swappable hd case mechanisms, lots of fans.
Should be good for watercooling too if you go down that route later, although if you already plan on a custom loop, there are better cases out there. But you can set up everything on a dual rad on the bottom. Would still be sexy.
http://www.silverstonetek.com/produc...=FT02&area=usa
http://www.newegg.com/product/produc...82E16811163161
It's a bit pricey, but is one to last.
Another great case is the Corsair Obsidian 800D. Huge, expandable, but also even more expensive
The Silverstone raven is a more
cool looking case if looks are you primary concern. Still has the mobo rotation, but plastic front.
http://www.newegg.com/Product/Produc...82E16811163154
About a hundred bucks cheaper.
I mean, the money is a lot for a case, but I think that the price for these is less than the money you'd save by building custom instead of buying Alienware. Then you can invest the rest in a better graphics card, better ram, a better processor, or maybe a larger monitor. Or even a custom loop if you feel brave (which I'd recommend the 800D for)