$500 is not considered budget at all. That's enough to get you a really decent one. If you're diligent you can probably shop around and find a used 1080TI. That's probably best bang for your buck.
Honestly, You could find a used RTX 2080's at that price on eBay, or better yet. Get an RTX 2070 with that price there some good deals around Amazon, eBay, Newegg etc...