I just browsed thru the Cabela's catalog and found the model I described above.

Minn-Kota model # RT74/S 24 volt. 74 lbs. thrust. 42" shaft. $485.

I didn't mean to make Minn-Kota's sound bad, just letting you know of some possible problems you might encounter. Avoid the 12 volt motors, or the motors with the short shaft, they aren't really suitable for river use. I wouldn't get anything with less than 65 lbs. thrust for a boat mentioned above.

I'd love to outfit my driftboat with one, but I'm a little shy on cabbage, and I need to replace some reels first. Maybe next year........
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