I'm going to guess 22s as those are all common sizes for 22s. IMO 285/45/22 is the best. Its a factory tire size and won't rub (depending on wheel offset) on a 2/3 drop.
A lot of ppl like the 305/40/22s for the width they give, they are slightly shorter then the 285/45/22 (32.1" to 31.6") but are slightly wider (11.2" to 12") and may need slight molding of the inner fender plastic.