Going in a couple of weeks to stay with friends on Oahu. Where's a reliable shop with good selection (I'll have trasportation where ever)? How much should I expect to pay? And most importantly what size/type of board should an intermediate surfer (from the east coast) look for, keeping in mid I'll probably be just watching if the waves are over DOH? Extra length seems to be an important aspect in Hawaii. Any help would be appreciated.