Maybe just an idea but the smaller the cheaper. Unless money is no object then just get a jet motor from some airplane either f-18 or something newer then stick it to a boat and there ya go.... just kidding though. But seriously you can get some high speeds out of the smaller boats, somebody hit 50mph in a 26in black jack or 130mph+ in some rigger. Somebody would have to chime in because I'm not willing to look up.[X(]

Ivan.