I've been watching this thread with interest and am glad you found an option on it John. I wouldn't be worried about warranty either, most of outboards out there are pretty good, and there should be plenty of info out there on the specific one you want. Go for it.
I used to have an older (early 80's) Robalo 20' CC, and I re-powered it with a Suzuki DF140 in 2007. Great engine. About two months later I drive down the ocean, get in the boat, put the motor down, turn the key and nothing. It isn't making sense, I have power. I check the harness going into the engine, everything looks good. There's a mesh tube covering a the wiring and the control cables where they come out from the hull, and while I can't think of any reason there would be a problem, but I slide it up anyway because I can't think of anything else, already checked everything forward at the switch and all. Lo and behold, I see an automotive blue butt connector with the wire hanging out one end of it. I stick it in enough to hold, go to the key, starts right up. I realize that whatever hack job they had installing the motor cut a wire by mistake and repaired with a cheap connector that rotted out in a marine environment in about two months. Probably didn't know any better. I was lucky that day, I kept a little electrical kit in the boat with marine shrink wrap connectors and was good to go and went and caught some fish.
So when you said the reason you wanted to do it yourself was you didn't want a hack job either I could certainly relate......