As Nails said the Gen 3 10x0 line is a good starting point. In general the range is ordered in performance so a 1050 is lowest performance up to the 1080. The TI version has additional improvements so a 1070ti sits between a 1070 and a 1080 in the performance ranking. Its not quite that simple as some manufacturers provide overclocked versions. Above the 1080i there are the Titan and Titan X cards.
In addition to price the other major considerations are size (some cards have smaller versions) and power consumption, the technical details for a card should indicate requirements. Superfly is a version of Cycles so you can get an idea of performance by checking benchmarking websites or Youtube PC builder channels (eg Linus) as many of these include a Blender test. I'd suggest two important qualities to look for are how effective the cooling system is (to avoid thermal throttling) and if the card is noisy.