Heyo Timy-90
Since you're suggesting the 750 ti and such, wouldn't the new 1050 ti be appealing? That card should work like a charm, although might be abit more expensive than the ones, you've suggested yourself.
Another thing. I don't know whether you feel it or not, but wouldn't a RAM upgrade be amazing? Personally I have 16gb of RAM, and I feel like that's on the edge of not being enough for me. You can easily find a 4gb stick used, and just plop it in to get 8gb of total RAM. Well, with that said, that's only an option if you have 2 DIMM slots, and only 1 is occupied at the moment.
Anyhow, good luck finding the perfect GPU!