I've had a 19'Willie With a 175 sportjet for the last six years. I fish the ocean, bays, green peter res, foster res, Detroit rs, Willamette, Columbia and little rivers like the Santiam North & South. It has all the power I have ever needed but because of the small dog house I have ROOM.
Once I chose a wrong path going down stream on the north Santiam and found myself face to face with a log jam. Because of the boats lite wieght and the power of the sport jet I was able to stop the boat and back it up in pretty heavy currant. but the tight turning ability of the sport jet is what saved my bacon.
A V6 or V8 will have a faster top end speed, but there isn't anything faster out of the hole and fater up on a plain than a sport jet.
With my family the inboard works best because I can pull tubes and the kids can drive from the stearing wheel. The small dog house still gives me good fish fighting room.
If it is the HP you want I think Sport Jets are in 240 HP now but the dog house is the same size.
TEST DRIVE THEM ALL. Consider what your needs are, buy, and start having fun.
Check out Willies link
http://www.willieboats.com/sportjets.htm
my second choice would be an outboard..