Affordable laptops and gaming do not usually make a great match but this product is an exception. You cannot get a better value for money gaming laptop than the Acer Aspire 5560G on sale at Dabs for £320 including delivery.
The product is barely more expensive than other entry level laptops and still manages to pack a pretty powerful punch.
It is powered by a quad-core AMD A6-3420M processor clocked at 1.5GHz turboboosted to 2.4GHz, with 4GB of RAM, a 500GB hard disk drive, a DVD writer, a dedicated graphics card (MD Radeon HD 7670M with 1GB dedicated RAM), GbE, Wi-Fi, a 15.6in 1,366 x 768 resolution, a webcam, three USB ports, VGA out, HDMI and up to four hours of battery life thanks to a 6-cell, 4,400mAh battery.
Note that you should be able to upgrade the laptop - which includes a raft of Acer applications like Acer eRecovery management - from Windows 7 HE to Windows 8 Pro for only £15.