Alot of guys on here use a solas 13/17 concord (awesome freeridding prop), skat track 12/17 (better for flat water as it is meant to have more bit down low) There is also the impros Hooker prop which seems to be getting good reviews from the peeps in the states... Just get rid of the stock one its a POS
I just got back from my first ride with my new HOOKER it is the shiz! the ski feels like it has another 20hp, it even hooks up in whitewash, best mod after a pipe! I have a skat trak 9-17 ST-ST prop for sale if ya keen.