The 750ti is still a good card but the RX 480 isn't too much more and gives you quite a bit more frames. (https://imgur.com/a/sw5u3#rfPxYci check this out!
) On all games tested on ultra got over 60 FPS. (also check this out http://gpu.userbenchmark.com/Compare/Nvidia-GTX-750-Ti-vs-AMD-RX-480/2187vs3634) I don't think you are going to run anything too heavy so if you are going to go with the RX 480 you won't need the 8GB edition. The 4GB is enough to get the job done.
SSD won't add frames but will boost boot times on games and your OS. The PSU isn't the greatest but it's adequate. If you want to save money the OG PSU is fine but if you are willing to spend more money that could be used in another build the XFX or SeaSonic PSU is the way to go.