linkin
VIP Member
This is a good power supply, but if you are looking to invest a little more money I would recommend a 650w xfx black edition psu or a 750w xfx black edition psu, or the Corsair 650w HX series PSU.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139005
As for the OS, it won't effect gaming as much as convenience. I recommend an OEM system builder version of windows 7. You can get home, premium, professional, or ultimate. It just depends on how much money you are willing to spend and if the better windows 7 packages are worth it.
I was about to post similar things but it seems you've got it covered

OEM is the way to go for an OS. Rosewill powersupplies... I wouldn't have one
