I was thinking of getting an fx-8320 or fx-8350.
Everything else looks pretty good but if you are pretty stiff on that $600 budget, you did a good job!
I would look at getting the GTX 1050 ti instead of the 750 ti for about $30 more. The 1050 ti has new Pascal architecture meaning less power needed so you can save money and a psu. Also. the 1050 ti has a much higher base clock and boost clock allowing you to overclock the gpu to get more performance. Finally, the 1050 ti is the best card for budget pc's right imo because all the amd cards prices are jacked because of ether mining so the 1050 ti is a good buy.
What color did the stock fan come in? I'm deciding whether to get 4 red led fans or just 3.