I think the first one is best, especially as it appears to come with a monitor. Good processor, strong graphics and a decent amount of RAM.
I don't like the second very much, and not just because it's the cheapest. The Nvidia 465 was a bit of a flop and is outperformed by it's little 460 brother.
The third one is quite decent, although I would swap the Nvidia 465 for a Nvidia 1gb 460 as it's only £2-3 more. If you don't already have a monitor it would probably turn out more expensive than the first however, for not quite as powerful spec.
Why won't it work, thanks for the advice, I agree the first is the one for me. I'll get a different monitor and I won't upgrade the ram to be honest but it looks a good buy and the reviews have been good as far as I can see. Cheers mate much appreciated.
Definitely the first one in terms of the core up-front specification although I wonder at the quality of the 'Chillblast' mouse, keyboard and speakers. Also, I hope you noticed that the VAT inclusive price is in fact £1058!
Cannot help but feel that there is something slightly underhand about a vendor selling consumer-oriented PCs who highlights VAT exclusive prices rather than a consumer price.
It's worth checking out the gamer systems on overclockers.co.uk. I got a Titan Goliath last year and it's pretty ace. At the time it was about £850, but they've changed the spec so it's a bit more expensive now. They give you options for graphics card, hard drive and so on too.
On a side note, if you're also looking for a gamer mouse, the Roccat Kone is awesome!