I would believe it would be the storm enforcer due to its flexibility in management. if you can get a side fan instead of the window, it would be better. the cm690 is also good for pimpin it out with fans to get alot of cooling.
I would paste from the order page but there are tonnes of amenments so heres a summary:
Storm Enforcer Case
AMD Phenom II X6 1090T BE
ASUS® M5A78L-M/USB3 (Its the Home/Office mobo)
4GB RAM
Radeon HD 6790
500GB HDD (the generic ones)
Corsair 650W PSU (out of stock???)
COOLIT ECO II ALC (I wanted the C240 but i cant select a full tower case)
I chose the home office selection because I will only use this for one year and have no plans on upgrading this specific pc but plan for a complete rebuild next year