20's are too small, 24's are way too big. I'd go 21 or 22. Do 21 if you drive on bad roads or you want to performance drive a lot so you can use thicker rubber. You'll have to lower the car just right to get a good look. Do 22's for that baller look if most of your driving is on smooth roads without mountain twisties. Only a minimal drop would be needed for 22's.