big wheels
I saw a set of 28s on a car the other day and thought they looked hideous, and they were on a H2! If you are driving on a prepared race course, then maybe you should go with a tire/wheel combo with no sidewall, but on the street you need to have some sidewall to flex and protect the rim! I also don't like combos that are a lot bigger overall than stock unless you are building a "monster truck" "rock crawler" or a "bogger", but if you are then keep them off the street because they will be less stable in normal driving maneuvers.
just my opinion