There's also this hp laptop which look like an option:
HP Pavilion dv7-6103ea
CPU - AMD Quad-Core A6-3410MX APU processor (1.6ghz turbo 2.3ghz)
RAM - 6gb RAM
HDD - 2x750gb (7200rpm)
GPU - AMD Radeon HD 6545G2 (integrated AMD Radeon HD 6520G APU processor graphics card and a dedicated AMD Radeon HD 6490M graphics card in CrossFire)
Display - 17,3" HD+ High-Definition LED HP BrightView (1600 x 900)
Optical - Blu-ray ROM with SuperMulti DVD±R/RW Double Layer.
For £779 from the HP website. I think the sony is better value, processor, display, graphics look better on it though this has a bigger hdd.
I've also heard you guys talking about lenovo and I've found these 2 on amazon:
Lenovo IdeaPad Z570
The g770 probably has my vote there, gpu looks better and i think the i7 is probs overkill? And it's £100 less...