In the ocean we can run any two stroke, so no problem there, I have a 15 horse too, old chrisler 1980 era, Just for grins I put it on my 9.5 once, really scoots. That thing is a bit too heavy to be tossing around on the mac though, so it stays home. I love my little two cylinder two smoke evinrude 4hp. It has gas tank built into the engine as well as external plug for a gas tank.
Hey do you fish? lots of times when I go over to Catalina, I get my friends interested in going too, They have a 24 foot power boat and we go fishing in the morning when we stay there.
You saw Bills baltic, I think they are well made and worth the price, they are about half what a mercury or zodiac would cost, being made out of pvc, they will last a long time if we keep them out of constant sun.
Like storing them on top of the boat. I think the 9.5 is a good choice with the air floor, think life raft too, although they are not designed to be life saving device, they will in a pinch work as a extra measure of safety.
We have one of those seat pouches that fit over one of the seats in ours, it stores a couple bottles of water some sunblock, a large piece of pink nylon cloth, and my hand held radio when we use it. I also want to store some medicinal whiskey, you know those little airline bottles of jack Daniels. You know to give me the courage to laugh death in the face, in a emergency situation.
The other thing we dont do, is we dont carry a gas can with extra gas for the motor, I just carry a squeeze bulb siphon, some two smoke oil and take the dingy gas out of the main tanks. Main reason Ill probably get that suz 2.5 4 stroke as I wont have to mix the gas.
rowing the inflatable more than a few 100 yards in calm water is tuff, like what was mentioned, but you cant beat the stability of an inflatable. let alone being able to deflate it fold it up and drop it in the front hatch onto the bunk. Thats why I bought the 6.5 it drops right in the mac. In fact the 6.5 is always on the mac now. But thats a two person one and a half dog boat at best. Like Karen says it cute.
I cant believe all the boat junk I have bought over the years, just writing about this stuff makes me realize what a boat junky I have been.