for that setup the 570 and 6970 are likley to be to much gfx card for the cpu unless you can go to 3ghz+ even then i guess your pushing it some.
psu wise 650 to be safe although 550w would run it as its the recommended minimum. but if your gonna oc you will want the little extra headroom the 650w brings.
these are pretty much the options i have the corsair is about the most expensive i can go... R650 = £60-70
Go with the Corsair unit it's a really good price for S.A. and will be fine.
Keep in mind it's Corsair's entry level so it's suitable for a mainstream rig with a good gpu and mild oc.
If you intend on building an oc'd gaming rig i would spend some more money and get a TX series unit.