what do you mean by that? how could windows "be a lot lot better than it is"? m$ no longer has a monopoly that is why they came out with windows 7 and are advertizing it as they are. they realize they needed a better product to stop thier losses to mac and linux. and 7 is a fantastic os. as efficient and quick as xp and as pretty as vista.
i do like (perfer) an all up os3.9 or aros install to windows of any vintage but if you want 3d games, real 3d games, COD, bioshock2, batman arkham asylam, etc. etc. etc. you need windows, not mac, not linux, not amiga 
Quake 4 and Quakewars runs great on linux. Maybe those are fake 3D games?
And why spend 800 dollars on a gaming PC plus cost of OS when a 360 elite is 299 and has more games for it?
Heck, for the cost of an amped up gaming PC, you can get a PS3 AND a wii on top.