DLN: Not sure what your hesitation is, honestly I wouldn't hesitate if it's Mercruiser four-banger. Like I said previously, doubt I'll ever need the additional power of the 4.3. I had a 190 in a 22' sport boat for many years.
Easily got 35 knots with four adults and pulled many a skier. Best part was I could fill up for the weekend and never worry about what I did or went.
Something to think about - there is a lot of Alpha 1 boats out there with viable 140-190 engines and outdrives that make a replacement or repair cheap cause everybody wants, but really doesn't need something bigger.