oupss, my bad! ;-) So, 550W is enough for a 480, 470, 1060 or 1050ti.
So, if you have a crappy PSU, would be better to pick the cheapest one (1050 or 1050ti) and use the money that you saved to upgrade your PSU and add more RAM... As I can see in your signature, you only have 4GB of RAM. To play latest game with good performance, you should have at least 8GB.
That being said, i think it will be difficult to upgrade your GPU, PSU and RAM for Under 200$!
edit. Yes, upgrading to a 1050ti from a 750 will be a huge upgrade!!! As i can see, 1050ti are performing about like a 960!
Good luck!!! ;-)