Computer build advice

Hi I am currently in the process of building a computer and am in need of some adivce. I know these threads probably get old but I have been searching for about 3 days now and have finally come to a good choice.

Budget: 600-800ish dollars (trying to keep it as cheap as possible but not trying to cut corners with inferior parts)

Purchase site: Newegg of course! Unless cheaper elsewhere (Live in the US)

CPU: AMD FX 4170, (If it is worth the extra money, or on par or better than the i3/i5 chips)
Phenom II x4 900 BE (OC) or an i3/i5 Which ever one is suggested (no more that 200 dollars)

Motherboard: GIGABYTE GA-970A-UD3 AM3+ AMD 970 SATA 6Gb/s USB 3.0 ATX (104$)(Unless I decide to switch to intel)

PSU: SeaSonic S12II 620 Bronze 620W (84$ would like to stay under 100 dollars if possible)

RAM: CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) (51$)

HDD: Seagate Barracuda ST31000524AS 1TB 7200 RPM SATA 6.0Gb/s (55$)

GPU: I am having trouble Picking a graphics card. GTX 560, HD 6870 (Brand best for OC...EVGA/HIS?) My main question is will it be overkill to go with a GTX 500 series card, or a HD 6000 series card because, I will be using my 42'' 1080p HDTV at 1920 x 1080p.

Case: APEX Vortex 3620 SGCC / ABS ATX Mid Tower (34$)

DVD RW: asus (20$)

I already have windows

Mouse preferably wireless or Bluetooth but may go with a wired set-up

Uses: Gaming, I hope to overclock in the near future if necessary

Games: FBF3, MW3, Gran Turismo, Moto gp, Forza Motorsports, SKYRIM (Buying pc for this reason), GTA 4, Fallout 3. ( I realize that some of these games may not be able to handle max with this setup)

Questions: Do you guys see any bottlenecks in or places I can scale down scale down because of my max res (1920x1080p). Will the 620w PSU pose a major problem when OC?? And will it be necessary to go with intel if my resolution is so low Because of the tv. I might buy a new monitor in the near future if it is recommended.

Thanks for the help guys!