If OP doesn't want to buy one of my AS-IS GTX 1660 ti 6GB cards that were ex-mining cards (and I don't blame him if he doesn't, although they are still in working shape), then yes, a $200 New RX 6600 would be an excellent choice. (I sold all of my used ex-mining RX 6600 cards already. They were fairly quick sellers. Still have to get the last batch mailed.)
Edit: Here's a $69 RX "580" 8GB card.
www.newegg.com
I ordered and received four of these cards, but I have yet to test them.
That might be ideal, if you don't want to splash out a lot of money, but want double the VRAM (and a real RX 580 is a stronger card than a GTX 1650).