GQ,
35% of 275mm is only .1" smaller than 40% of 245mm (stock tire). Not worried about the height just the width. Anything will ride better than the Nakangs that are on there now. They sound like mud tires between 40-70 mph.
IM3506,
What size tire are you going to run on those 20x10's? 255/30? The CV3's are my favorite wheel!!!

If I didn't have so many other toys I would just buy them with tires but $2100-2500 just for the wheels is hard to justify.