When we first bought our SeaSearch 420 we plumped for a Tohatsu 9.8, mainly because my back was playing up so anything heavier was out of the question.
It was a great set up, planed easily with just the 2 of us, it was economical and quiet. Soon as we had friends or family with us, planing was a no no.
The only time I lifted it off the transom was to take it to be serviced, a stipulation to keep the warranty valid.
My back has now improved so we've bought a nearly new 25hp 2 stroke which I can just about lift myself.
Been out in it once, 4 up and boy is it good, too good for the conditions, couldn't open it up fully without risking flipping it or someone falling out.
As the new engine hasn't got a warranty, I don't need to get it serviced by a dealer, I can do it myself even while still on the transom. The only time I can see I'll need to lift it, is to take it indoors for the winter, and when I do I use a modified sack barrow as per most people on here.
If anyone is interested in a Tohatsu 4 stroke 9.8 with about 15 hrs on it, I know where there is one ;-)