Best Modular 600w PSU?
For about 60 pounds (100$)
For 60 pounds, this is the best you can get. 600w modular PSUs typically run around 85-90 pounds.
Unless you are running some crazy powerful rig, that 520W Seasonic will do a great job.
Corsair CX 600M semi modular PSU is a good one for £61.98 at http://www.amazon.co.uk/dp/B00ALYOTTI/?tag=pcp0f-21
For that price it's not going to be easy i see a semi modular 600w http://uk.pcpartpicker.com/mr/ariacouk/corsair-power-supply-cx600m edit lol to late already was beat to it.