That's not bad for that boat. In fact, from what I read your boat needs, that sounds pretty good. I know of a red Sunsport in Missouri that can be had for $11,750 and is in immaculate shape with a stereo. His ad is still listed, don't know if he still has it though.
But if you want a newer one, you'll need more than $11.
Me, I don't do spur of the moment things, so think it through before you pull the trigger.