PCI-E is a standard, so you don't need specific 'ATI' hardware to have the best performance. Only if you plan to run two in a Crossfire setting (one of the a 'Crossfire Edition' card), then you need hardward that complies with ATIs Crossfire Specifications. Same with SLI: only possible with SLI certified stuff. (Although one single nVidia card will work in any PCI-E board)
So, just get any good MoBo; any of the ones discussed in this threat will work fine.
The stock fan tends to be loud yes, and these cards do run hot. Get aftermarket cooling, like the one I have on my X850Pro (AGP, pipelines unlocked and flashed to X850XT PE):
ZALMAN VF700-CU 2 Ball VGA COOLER - Retail $29.99 + $5.99 shipping
This thing made my temps drop like 20C and is very quiet.