That heading isn't an attempt to be silly. There are so many online vendors offering cases and PSUs, it really needs you to review them. I could offer some whatnot, but it really needs you to supply what you feel you need. It's that simple, review and then pick a trusted vendor. I'll offer this one link and you can continue from there: http://www.frozencpu.com

I will suggest if you seem to have issues with your current PSU, pick a new one that's 100W better. A dual fan cooled PSU is a plus. Alas, if 600W is lacking anything above that is going to be expensive than others and as usual pick a decent name brand. Use a PSU watts calculator(google) and see what your real needs are and add the 100W. Remember, cheap is cheap, the end result usage show soon enough its quality.

tada -----Willy Happy