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i just went through this exact dilemna w/ my 18. all the new 4 strokes are so heavy i wound up getting a 2 stroke johnson. somebody (i think bushwacker) emailed me a spreadsheet comparing the specs on 150s; very detailed and imformative. ill see if i can find it in my email. if not pm him, he probably still has it. if you have the money, it seemed to me the etecs had the best power to weight ratio out there, but they are pricy as heck. as far as 4 strokes go, i see a lot of suzuki 175s on the 20 footers up here. good luck on the motor hunt.