I went with the OJ 14.25 x 14.5 . . . boat runs like a sports car now! (X1). I have the RTP-1 engine. You will not go wrong with that prop, if you are mostly wakeboarding. Good luck.
I have the MCX, and that is the same prop, OJ 14.25x14.5, I'm using. With about 1700-2000lbs added, the rpm's are only 200 more than the stock prop & stock ballast.
We offer three different sizes in the XMP EDGE line, 14.25 X 14 LC, 14.25 X 14.5 LC and 14.25 X 14.75 LC. The 14.25 X 14.5 LC is the most popular of the three sizes. Give me a call with any questions. Eric @ OJ PROPS 800-359-9730.