I just purchased a 2007 Rinker 226 Captiva bowrider. It has a 21 pitch aluminum propeller on it right now. My previous boat (17.5' Larson) had a "High 5" stainless steel so I'm worried about the aluminum prop on this one. Any suggestions or comments are welcome. I would like to purchase a stainless steel but what exactly should I go out and get? I mainly use the boat for skiing.