if they are going to hit the suspension they might do that with or without wheels. the benefit to buying aftermarket wheels is you get a wider offset to get them away from the suspension.

why are you getting bigger tires? why not get the same size as what was on there? there is not much benifit from jumping one inch. it will only give you .5 inch more ground clearence. i would still with stock size tires or jump to like 28-29 inch range. if you do that i would def suggest wider wheels.