Not to be rude, but bayliners are crap. To get a quality diesel powered boat in good condition you are going to spend $$$. For a center console, if I had the money, I would consider one of these with a straight shaft, not a jack shaft, so you may have do a little dredging at the end of your dock first.
http://www.albinmarine.com/ExpressTrawler/ExpressTrawler.html