I just recently ordered my hardware for my first gaming PC from newegg.com and should be receiving them tomorrow. I tried to get a decent setup but this being my first build I wanted to play it safe I heard the 7970 GPU would have been better but the 680 benchmarks right around the same apparently. I will be playing on a Full HD monitor that supports 1920x1080 and would like to run games at the max settings if possible.
Well the 7970 GHz is about equal to the 680, the regular 7970 is about equal to a 670 maybe a little better. Anyway the 680 is like extremely high end, you can play just about anything you want at pretty close to ultra keeping 60fps.
At 1920 x 1080 you should be able to play any game on maximum settings for years to come, I have a 3 year old Phenom II x4 @ 3.7GHz and a Radeon 6950 and have not got any games I can't play maxed (except ubersampling in Witcher 2) at 2560 x 1440.