Your build looks good, but I would try to save a little more and get a 4690k and 16GB RAM. The rest of the build is actually really nice. I usually complain about people choosing a cheepo power supply.
The reason I recommend a faster CPU is because GTA will push it pretty hard. I had a 4690k @ 4.2ghz getting almost maxed out on 1080p with an even weaker GPU than the one you are choosing. Dont get me wrong, it will play fine, but it will be even better with a faster chip.
For the RAM, 8GB is fine but I find myself using more than 8GB regularly now that I have 16GB of RAM. It will get used.