I have a 28' Bayliner 288 at 9000lbs -- it has an upper flybridge so tends to get pushed by the wind quite a bit.
For a kicker, I have a 20HP Tohatsu on a RemoteTroll steerable bracket. Has no problem moving the boat around and turning it even in winds 15kts+. I got it at Sooke Marine Centre and he added a high thrust Solas prop option.
Of special note, the Mercury Bigfoot Prokicker is actually made by Tohatsu (they make the small Nissan's as well). The 15Hp and 20Hp Tohatsu's are the same engine and weight -- just different carb setup. I chose the 20Hp because it has remote trim/tilt, a 12A alternator and a built in pull start for emergency starting. This is my 4th season with it -- runs great, well built, hightly recommended.