What PSU do i need to power this?

Here you go bud PSU:XFX Core Edition PRO550W (P1-550S-XXB9) 550W ATX12V 2.2 & ESP12V 2.91 SLI Ready CrossFire Ready 80 PLUS BRONZE Certified Active PFC Power Supply
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I've seen this, it's a corsair too, has good reviews and is under £50, by 1p   so do you think it's any good? Plus why isn't anyone else commenting on this...

http://www.dabs.com/products/corsair-memory-600w-builde...

that's a low grade PSU but it will do

If u r planning to do crossfire in the future, then get a 650W PSU.

It will be a safer bet but will cost u more