in probably another year. But I was told other places to go at least 750w for the PSU
This complicates things on the PSU front somewhat.. For your current rig, getting a 750W PSU should be ok even considering a good amount of overclocking applied on the CPU.. However, adding another GTX 480 raises the requirements wherein an 850W PSU will be bare minimum.. You might need to get an extra 100W or so to keep all power requirements under check and still be left with a little headroom.. May be the Corsair TX 950 will suit your purposes here.. Altogether, you should definitely look to get a minimum 850W PSU for now.. As for the casing, the CoolerMaster HAF X will be good.. Every review (users + others) i've read till now suggests it to be a great case especially for GPU cooling..