Consolidated it down into the important stuff. Easier to compare
CPU Intel Core i5-3570K Motherboard GIGABYTE GA-Z77X-UP4 TH Graphics EVGA SuperClocked+ GTX 660 Ti 3GB RAM CORSAIR Vengeance 16GB (4 x 4GB) DDR3 1600 SSD Crucial M4 2.5" 64GB SATA III HDD Seagate Barracuda 500GB 7200RPM Cooling CORSAIR Hydro Series H60 Case COOLER MASTER HAF 932 Advanced PSU CORSAIR HX Series HX750
CPU Intel Core i5-3570 Motherboard ASUS SABERTOOTH Z77 Graphics EVGA SuperClocked GTX 660 Ti 2GB RAM G.SKILL Ripjaws Series 8GB (2 x 4GB) DDR3 1600 HDD Seagate Barracuda 2TB 7200 RPM SSD None? Cooling Stock fan? Case COOLER MASTER HAF 932 Advanced PSU CORSAIR HX Series HX750
I can confidently say the first build will perform best in gaming due to the better graphics card and a solid state drive. Plus there is the option of overclocking for even more performance whereas the second build cannot be overclocked.
First one...if you are going to play just games, I do not think you need more than 8GB RAM. I would consider upgrading the SSD to at least 128 if not 256! If you are tight on a budget, please consider taking an 8GB RAM and invest that saving into a higher capacity SSD.
G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBRL
Seagate Barracuda ST2000DM001 2TB 7200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive
ASUS DRW-24B1ST/BLK/B/AS Black SATA 24X DVD Burner - Bulk - OEM
I will be using the same power supply for both.
get the first option, why do you have like 8 components for each build? is it a barebones kit? dude just buy each individal part you want. dont worry if its bundled together. get a 3570 k a gtx 660ti, a mobo that supports the 2. and any harddrive, any dvd drive, a power supply with atleast 700 watts try for a bronze or silver vertified. 8gb of ddr3 1600 and a nice case u want. THATS IT not hard son. buy the parts u want dont cheap out