Well I don't have a certain budget, just a reasonable price. I don't need the very max high end gaming PC, just a good one that will last for years. I'd say roughly 800-900 dollars.
I have a samsung syncmaster 213t, which is 1600x1200.
The games will be Skyrim, BF3, LA Noir, ARMA 2 and such. Pretty much most of recent good games.
I will start using SolidWorks for 3D design in the next year, but other than that it will mostly be used for gaming.
I guess I could jump from 750W to 650W, for example CORSAIR TX 650W, but the value difference is about 17 dollars, which is not too much for extra 100W. But then again do I really need that extra 100W.