Get what you like. Wheels can get really expensive really quick and its easy to buy something and end up hating them. I have some 19" TRD's I'm selling right now if you want to go back to the old look. XXR's are cool too but it seems everyone wants or has them. Maybe that's just me though. Either way, if you like XXR's the best, go with those since they wheels you pick will be seen by you the most. I agree with Matt, 20's are fine but will make for a rough ride and limit drop potential. I went to 18's recently (AME wheels) because I didn't like the feel of the 19's and there are more tire options with 18's.