Which system to build please help?

[Illest]

i have a list of three systems here,that i have come up with, its easy to tell which is the "best" overall but i want to know which i would get the most bang for my buck for. I want to be able to play games like skyrim and battlefield 3 at 1920x1080p on possibly the highest settings possibly.

#1::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::$615::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
MOTHERBOARD
ASRock Fatal1ty 990FX Professional AM3+ AMD 990FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard

PROCESSOR
AMD Phenom II X4 955 Black Edition Deneb 3.2GHz Socket AM3 125W Quad-Core Processor HDZ955FBGMBOX

GRAPHICS CARD
DIAMOND 6870PE51GB Radeon HD 6870 1GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card

RAM
CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMZ8GX3M2A1600C9B

POWER SUPPPLY
hec XP1080 800W Continuous @ 40°C ATX12V / EPS12V CrossFire & SLI NVIDIA HYBRID-SLI Certified Modular Active PFC Compatible with Core i7 Power Supply

#2:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::$685:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

MOTHER BOARD
ASRock Z68 Extreme3 Gen3 LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

PROCESSOR
Intel Core i3-2100 Sandy Bridge 3.1GHz LGA 1155 65W Dual-Core Desktop Processor Intel HD Graphics 2000 BX80623I32100

GRAPHICS CARD
(2x) SAPPHIRE 100315L Radeon HD 6850 1GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity

RAM
G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-4GBRL

POWER
CORSAIR Gaming Series GS800 800W ATX12V v2.3 SLI Ready CrossFire Ready 80 PLUS Certified Active PFC High Performance Power Supply

#3::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::$750::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
MOTHERBOARD (170)
ASUS Maximus IV Gene-Z LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 Micro ATX Intel Motherboard

PROCESSOR (225)
Intel Core i5-2500K Sandy Bridge 3.3GHz (3.7GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor Intel HD Graphics 3000 BX80623I52500K

GRAPHICS CARD (270)
HIS IceQ X Turbo H695QNT2G2M Radeon HD 6950 2GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity

RAM (30)
G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-4GBRL

POWER (80)
COOLER MASTER eXtreme Power Plus RS700-PCAAE3-US 700W ATX 12V v2.3 Active PFC Power Supply

 

[Outlander_04]

the third choice is the best gamer

The first one is the second best , but includes junk parts and would probably blow up

and the 2nd one is a weakling