I forgot about the case question. I agree with Lmeow that you will need to add a case fan or two for more airflow. It's not a gaming case but it gets the job done. Just make sure you have more outflow than inflow. If it were me, I'd also cut a hole in the top and install a grill and 120mm top fan.
i finished a build just like yours a coupe of years ago. This is it:
AMD phenom II x4 965 @ 3.4 ghz
4GB Ripjaws G.Skill
500GB seagate HDD
HIS ATI Radeon HD5850 1GB
AreoCool VX-E Pro
i powered this build with an Amacrox Freestyle 500w its been going fine for the past 2 years. i built it for hardcore gaming thats what i have been doing, its held up fine.