Depending on your price preference any board from
HERE will do just fine. There have been allot of users with these manufactures, MSI, ASUS, XFS, ABIT. You'll want to shy away from ECS as their board have had allot of unhappy customers here on the forums. Since thus far you have chosen an ATI video card you will want a board that supports future upgrades to dual cards, so a board that supports ATI Crossfire technology. For the power supply you will need one that is rated at a good 500 watts plus and offers two PCI E connectors. ATI/AMD offers a list of Tested and Certified Power supplies
HERE. A model from Antec, Coolmax, and thermaltake should fit the job great. If you are going to upgrade to dual cards in crossfire format you will need a more powerful PSU click the link offering certified power supplies for dual card setups.

To BC