hi dan
i thouroughly understand your situation and the good news is that for your budget of £400 you can get a pretty decent gaming rig,yes there are some excellent gaming p.c,s for less than £400(for even better rigs try pushing the budget to £500)
the first system i have for you is the "cyberpower Gamer Ultra 600"( http://www.cyberpowersystem.co.uk/system/Gamer_Ultra_600/) and this pc is based around the AMD Phenom™ X3 8650 Triple-Core processor which is a excellent modern cpu which will run all the latest games and applications and this is backed up with 2gb of ddr2(pc6400) memory clocked at 800mhz
storage is supplied in the shape of a massive 500gb sata II hard drive and theres a sony dual format dvdrw drive for your burning tasks
as for the graphics you get the ATI Radeon HD 4670 with 512mb of gddr3 memory,and this is more than enough to run todays games allthough you may need to lower some of the detail settings
this is a excellent pc for its price (£409 in. VAT) however for another £90 you may want to consider the "cyberpower Gamer Ultra Yin"( http://www.cyberpowersystem.co.uk/system/Gamer_Ultra_Yin/) and this again is based around the AMD Phenom™ II X3 710 Triple-Core CPU,however instead of waffling on here is the full specs for the gamer ultra yin:
CASE: Cyberpower Gangster Mid Tower 420W Black
Lights & Illumination: NONE
Extra Case Fan Upgrade: Default Case Fan
Power Supply Upgrade: STANDARD CASE POWER SUPPLY ***No OverClocking Possible***
CPU: AMD Phenom™ II X3 710 Triple-Core CPU w/ HyperTransport Technology ***Overclockable XXX***
Overclocking Service: No Overclocking
Cooling Fan : AMD ATHLON64 CERTIFIED CPU FAN & HEATSINK
MOTHERBOARD: (Socket AM2+)MSI K9A2VM-F V2 AMD 780V Chipset DDR2/1066 MBoard USB2.0, & 7.1Audio
MEMORY: (Req.DDR2 MainBoard)4GB (2x2GB) PC6400 DDR2/800 Dual Channel Memory (G.SKILL PQ Series w/Heat Spreader)
VGA Power Supply: NONE
VIDEO CARD: ATI Radeon HD 4830 PCI-E 16X 512MB Video Card
VIDEO CARD 2: NONE
Video Card 3: NONE
LCD Monitor: 19" TFT Active Matrix LCD Display (19" Wide TFT Active Matrix LCD Display Monitor)
2nd Monitor: NONE
Hard Drive: Single Hard Drive (500GB SATA-II 3.0Gb/s 16MB Cache 7200RPM HDD)
Data Hard Drive: NONE
Hard Drive Cooler: None
Optical Drive: SONY DUAL FORMAT 20X DVD±R/±RW + CD-R/RW DRIVE DUAL LAYER (BLACK COLOR)
Optical Drive 2: NONE
SOUND: HIGH DEFINITION ON-BOARD 7.1 AUDIO
SPEAKERS: NONE
Network: ONBOARD 10/1000 NETWORK CARD
MODEM: NONE
Keyboard: Logitech PS/2 Keyboard (Black)
Mouse: Logitech Optical PS2 Mouse (Black)
Extra Thermal Display : NONE (AS SHOWN)
Wireless 802.11B/G Network Card: NONE
Wireless 802.11B/G Access Point: NONE
Flash Media Reader/Writer: None
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as you can see this is a excellent pc and also comes with a 19" flat monitor which is unusual at this price range and the inclusion of the radeon HD4830 means you can run games at high detail and resolutions,and since the HD4830 has a 256bit memory interface this equates to superior frame rates
finally and from another website i have found the "Acer Veriton M464 - Pentium Dual Core E2200 "( http://www.aria.co.uk/Systems/Special+Offers/AriaNet+Value/Acer+Veriton+M464+-+Pentium+Dual+Core+E2200+2.2+GHz+?productId=35273) which has the following specs :
Product Description - Acer Veriton M464 - Pentium Dual Core E2200 2.2 GHz
Type - Personal computer
Form Factor - Micro tower
Dimensions (WxDxH) - 18.3 cm x 45.5 cm x 37 cm
Localisation - United Kingdom
Processor - 1 x Intel Pentium Dual Core E2200 / 2.2 GHz ( Dual-Core )
Cache Memory - 1 MB L2 Cache
Cache Per Processor - 1 MB
RAM - 2 GB (installed) / 4 GB (max) - DDR2 SDRAM - 667 MHz - PC2-5300
Storage Controller - Serial ATA ( Serial ATA-300 )
Hard Drive - 1 x 320 GB - standard - Serial ATA-300
Optical Storage - DVD-RW
Graphics Controller - NVIDIA GeForce 7050
Audio Output - Sound card - 7.1 channel surround
Networking - Network adapter - Ethernet, Fast Ethernet, Gigabit Ethernet
OS Provided - Microsoft Windows Vista Business / XP Professional downgrade
OS Preinstalled - Windows Vista
Manufacturer Warranty - 1 year warranty
now instead of using the abysmal onboard graphics you could buy a new graphics card with the money you are saving on this p.c
and a ideal card for this pc is the "nVidia GeForce 9600GT 1 GB PCI-E"( http://www.aria.co.uk/SuperSpecials/Other+products/nVidia+GeForce+9600GT+1+GB+PCI-E+?productId=34697)
at just £68.94 inc. VAT this card is a ideal gaming card for anyone on a budget,it has a 256bit memory interface and a decent 650mhz core clock
you also get a mammoth 1024mb of gddr3 memory clocked at 900mhz(1800mhz ddr effective)(note: ignore the 800mhz memory clock,this is a printing mistake)
this will run games very well and also suppo