first, what socket. AM3/AM3+ for the FX line of chips or FM2/FM2+ for the APU chips.
second, do you plan on overclocking. cheaper boards has less/crappier VRM's and they are important for voltage for overclocking.
third, do you plan on crossfire/sli in the future with video cards? The 3 main AM3+ chipsets all have different number of PCI express slots which determine the maximum number of video cards you can add.