Dammit, another HAF X recommendation. The case really isn't that amazing. :/
And temps wise "hard to beat"? I doubt it.
As a rule of thumb from my POV it's about equal to my Level 10 GT, but I'm ultimately not quite satisfied with either case. What makes me happy about one of them makes me unruly about the other. Maybe the 800D is interesting, but I don't know. I'm at the verge of seeing if I can bribe a friend of mine into creating a custom case.
Or rather, bribe him into helping clean up these designs I'm working on so we can literally tell a machine to do it. >>