Yamaha, Merc (Tohatsu), and Suzuki are all good choices. The weight differences are so small that I can't see that as a deciding factor. Electric or pull start? Power trim or not? Both add weight.
Print out the engine specs for each maker and compare them. Who offers the best warranty? Which dealer is closest/most convenient? Obtain pricing for all. How close are you with your neighbor? Conducting business with a neighbor can go south quickly.
I'm a Yamaha fanboy, but I favor the 3 cylinder engines in this power range. The Merc-branded Tohatsu would get my money.