that will work good especially on those days you "crank it up" to the max!
jees i didnt even consider dual gpu cards. those are a monster in itself.
will u be using a full tower? cappy has some nice box's with several huge fans. cant remember what box it was though. i think they have 2 6 inch fans on the side which would be great for cooling.
i went and bought a big expensive tower only to find it cools 20 degrees better with the side off. pissed me off! (thermaltake kandolf 9000s supertower blk) cooling/airflow will be an important issue here. dont depend on a/c that should be just a benefit in my book.