Have you thought about the new Suziki V6 line that will be arriving soon. They will feature a true 250hp V6 with variable timing. At only 580lbs it is lighter than the yahama 225. According to the press and what I have seen at a recent boat show it will be the most advanced outboard arround. Check out the web page.
http://www.suzukimarine.com/sr04/df250/