Help with a gaming pc build for about £380-460

[Aquafresh]

Hello there! I'm looking to buy an gaming pc for about 380-460 pounds. However i do not know what i would need for a good build with that budget. if anyone could design one for me i'd really appreciate it! I do not require an monitor, Or Windows 7 or anything like that. Just an decent graphics card to run games like Modern warfare 3, Battle field 3 and World of warcraft in medium + Graphics.

Thanks in advance to anyone who helps!

[Fear]

For your budget this is about as close as i can get and it's still over.

CaseCOOLERMASTER ELITE 310 BLUE CASE
Processor (CPU)AMD BULLDOZER QUAD CORE FX-4100 (3.60GHz/4MB CACHE/AM3+)
MotherboardASUS® M5A78L-M/USB3: M-ATX, USB 3.0, SATA 3.0Gb/s
Memory (RAM)4GB SAMSUNG DUAL-DDR3 1333MHz (2 X 2GB)
Graphics Card1GB AMD RADEON™ HD6870 - 2 DVI,HDMI,2 mDP - DX® 11, Eyefinity 4 Capable
Memory - 1^st Hard Disk500GB 3.5" SATA-III 6GB/s HDD 7200RPM 16MB CACHE
1^st DVD/BLU-RAY Drive24x DUAL LAYER DVD WRITER ±R/±RW/RAM
Power Supply450W Quiet 80 PLUS Dual Rail PSU + 120mm Case Fan
Processor CoolingSTANDARD AMD CPU COOLER
Sound CardONBOARD 8 CHANNEL (7.1) HIGH DEF AUDIO (AS STANDARD)
Network Facilities10/100/1000 GIGABIT LAN PORT - AS STANDARD ON ALL PCs
USB Options6 x USB 2.0 PORTS @ BACK PANEL (MIN 2 FRONT PORTS) AS STANDARD
Operating SystemNO OPERATING SYSTEM REQUIRED
Office SoftwareNO OFFICE SOFTWARE
Anti-VirusNO ANTI-VIRUS SOFTWARE
Warranty3 Year Silver Warranty (1 Year Collect & Return, 1 Year Parts, 3 Year Labour) (£5)
DeliverySTANDARD INSURED DELIVERY TO UK MAINLAND (MON-FRI)
Build TimeStandard Build - Approximately 10 to 12 working days
Quantity
1

Price: £483.00 including VAT and delivery.