Which PSU?

[Mojo]

I've recently upgraded, but my power supply doesn't have enough juice on the 12v rails to handle my system (q6600, CF 3870).

My full spec:
Gigabyte GA-X38-DS4
Q6600 G0 (currently clocked at 3.4ghz)
Dual 3870xt
Dual 160GB HD in RAID 0

I've been tyring to work out what this equates to in amps on the 12v rail but am confused. Can anyone make any recommendations? Price is also a bit of an object, am buying on a budget really, no more than 60-70 quid if poss

 

[Mojo]

Are Corsair basically the only ones i should be looking at? It seems a lot of money to pay for a 520W PSU although i speak unenlightened atm =/