Hello I have been on the hunt to upgrade for two years and haven't pulled the trigger. I keep running into nice boats but with engines that I just don't like. Most of my hesitation comes from reading stuff on forums on engines I am unfamiliar with. So my question today is about yamaha hpdi in the 150 or 200 hp. How are they compared to the four strokes of similar hp? I have a 180 sportsman with f115 and I'm looking to move up to either a adventure or seafarer. I do a lot of trolling and speed isn't a issue. My wife doesn't enjoy smokey two strokes so I'm leaning towards staying with the four stroke if I find one with one. I have read that the hpdi doesn't smoke much and is farely quiet. So anyone out there who has had one or both to give me some first hand info? Also what is a good price for a used adventure used about ten years or so old? I'm in massachusetts .I have looked at about 6 adventures over the last year in my price range 18k and I find problems like leaking windows ,cracked(hair line) transom, block of ice in bilge. All in the 16k asking price and late 90's age with two strokes. Any help or opinions would be great . Thanks