MegaCool wrotesweet system, but with these specs I recommend an HD monitor with a higher resolution outputs like 1080p, you seem to have a crt monitor,
The graphic card is great so is the cpu, you wont have problems maximizing most of this current gen games..
About Windows 7 the ultimate edition is good, and you can always go for ubuntu, afterall its free :D
I'd love and HD monitor. There's no reason why I shouldn't get one when I have the cash for it but I definitely can't afford it at the same time I buy the actual tower.
And I think I'll stick with Windows for now. I tried Linux before and it was good but it's no doubt that Windows is the safer bet in terms of universability. But I guess there's no harm in dual-booting....
But thanks for your advice.