The pictures in this thread make me sick

 

There's nothing more subjective than the style/size of wheels. If you want to run 20's go for it. I would suggest running an 8" wide wheel with a 40mm offset and 225/35-20's for the tire size. You may have to make fender mods in the rear as it may rub under suspension compression.

Ride quality will go down and so will the vehicles performance. A 20" combo has a good amount of rolling mass.

Hope this helps.