Best Graphics Card under $100

Hey guys, my brother just got a "new" computer that needs a bit of upgrading, and he's not willing to spend more than $100 dollars on the GPU. So, what is the best gpu out there right now, in terms of gaming performance for that price.

Tell him to man up and get a GTX750Ti

get a used 650 Ti BOOST edition. They are selling for under $100 right now because of the 750 Ti. In fact I am selling one for $90 atm, and can't get any buyers. And it plays ANY game at 1080p and most games on high settings, and newer games you might have to bump down to medium.

AMD R7 260X is only a tiny bit slower than the 750 Ti, and $110 on