4GottenFate :
rwoody :
Depending on which games besides Fallout 4 you are playing, a GTX 750ti might work for you, but it might be more like medium settings. It is about the highest performing GPU at that price range. I would look around for a used 950 or 960 though, as you might find one dip down under $200. Other than that, save up another $50 or so and get a better card.
what version of the 750ti is the best bang for your buck?
the normal 750ti the 750ti oc the 750ti sc or the 750ti ftw?
Most of the 750ti's are around the same price range, from $100 to $135. The following models have some of the highest clock speeds and therefore the best value.
This one is a bit better value than a few others, coming in at $119. It's also a single fan model. One the upside, it will be smaller and quieter, but it will run slightly hotter. I would only go with this or the next model if you have a small case.
https://pcpartpicker.com/product/NMqdnQ/evga-video-card-02gp43753kr
This one is another single fan model and is a bit more expensive at $133, but it has the highest overclock of all of them. You'll have to decide if the slight overclock is worth the extra $14 over the previous model.
https://pcpartpicker.com/product/qCfp99/pny-video-card-vcggtx750t2xpboc
This is a dual-fan model, so it will be larger. It is priced around $133. It will be a little louder also, but it will run cooler, and a cooler GPU means you can play longer and push your card harder before it begins to overheat.
https://pcpartpicker.com/product/nfJwrH/evga-video-card-02gp43757kr
If you can get this one while it's still in stock, it's easily the best bang for your buck at $131, and it's the only 750ti in your price range that has 4GB of VRAM while the previous 3 cards have only 2GB. It doesn't have quite as fast clock speeds, but the extra VRAM is a huge help in open game environments. I would jump on this one if you have the money.
http://www.superbiiz.com/detail.php?name=GA-75TWO4G&c=CJ