I am not sure this is a good idea ,keeping more boards around for back-up unless you really need 2 systems up and running..
I have had like 3 7xx chipset based boards one year ago.Finally i had to build systems around them and sell those PC-s to be able to upgrade CPU or video card ,those money being practically wasted money.
So don t buy expensive boards , neither 2 cheaper ones , if you are not an overclocker
I wouldn t say 970A-UD3 is cheap ,it simply has the right price for a normal motherboard.
UD 3 series should be just fine quality wise.
Like
Dark Mantis said ,you don t need 16 Gigs of ram ,as games barely use 8 gigs even in a x64 OS .You can rarely see heavy ram usage in actual PC games at this time (even though there were times when games like BF 2 would require huge amounts of RAM in relation to what most people had in their PC-s ).
Good looking games rely now more on the VGA ram ,so buying 2 Gigs based video cards should be more suited for your gamer needs.
But if you really have money to spend it s ok ,but keep in mind it s not a necessity.