I would recommend you try Awlgrip Gold Label, I have been using it on my boats for the last nine years. It has been very effective here in the high-fouling Med and it does stay white above the waterline.
Re: Why Sunsqueeker?
In response to c_j comments/question about Sunseeker, I would say you face the following options: buy an American "boat", buy a river barge, buy a caravan, or stay in a hotel. If, on the other hand, you enjoy life in the sea, like travelling or like having the ability and...