I don't know what the prices are like in the US, but I'm currently using this
card. Bought it almost two years ago and it still runs games smoothly on more-or-less highest details. Back when I bought it, the price was just under €200, but nowadays the price must have dropped more than 50%.
Still, you can probably get something more up-to-date for the kind of money you're willing to spend, perhaps an R7 250
, which costs somewhere between €80 and €100 in my country.
On the other hand, if you're more interested in an nVidia chip, I can't really offer advice there, as I haven't used an nVidia card in years.