You can chop you RAM in half as you will be unlikely ever to use any of the extra 8GB.
In my set up I have 2 x 1TB HDD's alongside my 128GB SSD. One is for films,music,photo's ETC. The other is for my games as I have over 540Gb of games in my Steam folder, add to that Origin and Uplay.
Doing it this way means I do not have to re-install all my Steam games as a quick repair and Steam is up and running. Origin and Uplay are not quite so easy but I do not have many games on those platforms.
Apart from the above not a bad build except I prefer Nvidia for gaming seem to have less driver issues than ATI.