Well, you will most likely *EDIT: have trouble" with SLI if you're gonna go with AMD motherboards, since the nVidia chipset supported motherboards for AMD *EDIT: are becoming rare*.
The other consideration would be the CPUs TDP, make sure the motherboards support the CPU in this department. I assume you meant the AM3 AMD with DDR3 RAM support instead of DDR2, since the AM2+ is already outdated, might as well get the latest one.
While you're at it, why don't you post the rest of the components in details, just as bavman said.
The motherboard has little effect when it comes to performance. The features, however, are the main consideration before you decided to build a PC. Will you need e-SATA, IGP, abundant amount of USB ports, specific form factor, USB 3.0 support, etc. That's why we need the rest of the components details if we were to help you decide the ideal motherboard.
EDIT: Grammar error
@dipankar: Fixed that for you. I forgot to say that the nVidia chipset support for AMD are decreasing in numbers, probably because of the AMD ATi merging issue, which indirectly made nVidia 2nd choice. Thanks for the correction.