The RX 6600 is the best value for price to performance right now. RX 6700 XT is probably the next best for value and would be more along the lines of comparing to where your R9 280X stood when it was new. For 1080p gaming I'd say the 6700XT is the highest I would go, maybe 6750XT. I recently bought the 6800XT for 1440p and on some games it is overkill.
Of course, knowing your full system specs would be helpful in deciding on a GPU.