Merc, Yami, its all about what you like. I just did all the searching for a new main motor. I needed a jet drive, so a 4 stroke wasnt really a choice. I live in California, and the Yamaha 2 strokes dont meet the EPA standards, and you cant buy one in California. I went with a Mercury Optimax. They just came out with a 5 year warranty, still cant believe a 5 year warranty on an outboard. I have been happy with my choice. Good luck, and dont be in a hurry.