What size longboard wheels to get?

I have a 38" earthwing supermodel with 180mm trucks, bones red bearings, and .25 risers. I have wheels on them but they're freeriders (i made the mistake of getting the wrong ones) and since i'm not that experienced, i need some sharp lipped wheels for easier cruising and better traction. For now all im really going to be doing is cruising, carving, and some downhills, not really any sliding. What size/softness would you recommend?