PSU Advice

Corsair, Antec and PC P&C are all reliable, I have a corsair 550w powering a Q6600 and a 5770.

Do you intend on going SLI?

If not 650 to 750 Watt is more than enough, if yes, you need 750 to 1000Watt PSU.

Corsair & Cooler Master I can recommend. Be sure to check out the reviews for the ones that catch you eye.

For your current rig, my choice would be one of these:

http://www.komplett.ie/Komplett/product/ZKB_01COM/29_PSU/01_PSU/productdetails/10020303/CoolerMaster_Silent_Pro_M700_Power_supply_%28/RS700_AMBAD3_EU/default.aspx

or

http://www.komplett.ie/Komplett/product/ZKB_01COM/29_PSU/01_PSU/productdetails/15340676/Corsair_TX650W_Power_supply_%28_internal_%29_/CMPSU_650TXEU/default.aspx

Corsair 750w04dcarraher

Most brand name PSU's have 2 or more PCI-e connections. The Corsair tx750 has four 6+2 PCI-e connections. They can be used in gpu's that require a 6-pin and/or 8-pin connector.

Most brand name PSU's have 2 or more PCI-e connections. The Corsair tx750 has four 6+2 PCI-e connections. They can be used in gpu's that require a 6-pin and/or 8-pin connector.

jtcraft

That will do for SLI/Crossfire with power to spare.jtcraft