"There is nothing more horrifying than stupidity in action." Jawaharlal Nehru Sapphire is the only company that can't afford to ship a gpu back.They have to charge the end user to ship it back. Don't support Sapphire!
I'd say the best alla round to show pure GPU performance is 3d mark vantage, to show overall system/gpu performance, like cl3p20 said, I would use Aquamark 3 or 3D mark 06. Unique heaven is a good benchmark for Directx11 but isnt as common for comparison as the others I listed (check out hwbot.org)