I have visited this forum.it is very beneficial for me and it gives me lots of information that will be very useful to me in the future and i am giving you this expert link for your queries.
------------------- ATI RADEON HD 5670 – SERIES GRAPHICS CARDS FROM AMD
1. Do you plan to overclock
2. What's your budget
3. Do you need OS, keyboard, monitor, mouse, speakers, etc.
They will tell you the following:
1. If you plan to overclock buy i5 3470k, if not - 3470
2. 700W is too much unless you want to Xfire. 520W should be fine
3. Get an ASrock z77 Extreme 4 mb if you overclock
4. Change the video to 7870\
5. If you plan to oveclock get COOLER MASTER Hyper 212 Plus.
6 Get 2x4 DDR 3. They are optimal for gaming.
CPU: AMD FX-6300 3.5GHz 6-Core Processor ($129.99 @ Amazon)
Motherboard: ASRock 970 Extreme3 ATX AM3+ Motherboard ($84.99 @ Newegg)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($49.99 @ Newegg)
Storage: Intel 330 Series 60GB 2.5" Solid State Disk ($69.29 @ NCIX US)
Video Card: XFX Radeon HD 7870 GHz Edition 2GB Video Card ($231.98 @ Newegg)
Case: Cooler Master HAF 912 ATX Mid Tower Case ($49.99 @ NCIX US)
Power Supply: Antec High Current Gamer 620W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($69.99 @ NCIX US)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($22.98 @ Newegg)
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2012-12-29 00:08 EST-0500)
Then just put your HDD in there for storage. If your budget is lower, take out SSD, wont affect gaming performance, but will slow down boot time, game loading time etc. If you have more money, i strongly suggest a 120/128 GB SSD.