You are right AMD use more power and creat more heat. But the PSU is most related to the GPU you get, not the MB, because most regular MB use less than 50-60W.
If you buy the aftermarket cup cooler like XIGMATEK Gaia SD1283, or hyper 212evo and you will be fine.
And I will pick the MB like Gigabyte's 990FXA-UD3, Asus Sabertooth 990FX.