which Graphics Card !!

[Accessless]

I think I'll recommend the ATI Radeon 5750, rumbles in at a 4.2 on my GPU rickter scale. Albeit at the high
 end of the £100 budget at ~£95.
(I'm not an Nvidia or Intel person, I just can't reason out the prices. I think that they charge the prices that they do because they can.)

[soybean]

The paperwork reads......
Hiper power 530W truepower power supply - SLI ready.
 

Seems like you're talking about your power supply, but what about your motherboard?  I confess I don't know much about SLI but I believe the motherboard must support it.  Can someone confirm this?