What kind of blower? If it's a roots or screw then DEFINITELY don't go over a 3.27, it's totally unnecessary and 1st and most of second will be useless on the street. With a centri blower you could get away with 3.55's, but it's not needed, 3.00 would work well for cruising and the blower will more than make up for the higher gear.

 

since you are supercharged i say go with 3.73s