If you're considering a kicker, don't waste your time with a small HP. Noisy single cyl drink mixers with above water exhaust and not enough power to handle even a light wind. No too mention, as an auxillery (emergency) motor...almost better paddling.
Do it right with an 8 or 9.9 high thrust minimum 4-stroke for walleye/salmon/trout. Musky guys would benefit from 15-20hp for speeds 4mph and up.