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A final option that has not been mentioned is a Mercury Optimax ProXS 150 (about 170 HP and $10,500) or 175. (about 195 HP and $11,500), economical and powerful 2-stroke DFI's. These only weigh about 430#

Here is a classic Outrage 21 that has one of these installed. The owner told me the boat does over 50 MPH with the 150 ProXS. Scroll backwards to see the engine photos.

http://www.boattrader.com/listing/197...-103190005

I also think that for those not seeking high speed, the new Mercury 4-stroke 115 ProXS, about 125 HP, that Grizzley mentioned, would be an excellent, economical (about $8,500) choice. The boat should run around 42 MPH with this engine.