I would get the Tohatsu. I think that it is a good match. It has all the bells & whistles, like a real forward/reverse shiftier & a 12v charging system. I have had good luck with Tohatsu in the past. Reduced weight is a big plus in my book.
Used outboards, are a roll of the dice. Even if the 8 wasn't so heavy, I would shy away from buying one that I didn't first see in person & test out in the water for several minutes.
I had a bad experience a few years ago. I bought a little used 6hp that ran great in a garbage can full of water, for the minute that we tested it before I bought it. When I tried it on the boat a few days later, it overheated in just a few minutes. When I tried to disassemble the lower leg to fix the water pump, I found that 2 of the bolt heads had been broken off & glued back into place, just for show.