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If you want to go to the max HP hull rating, a good option is the Honda 100, which comes in at 359 lbs for the 20" shaft.

Another good (possibly better) option is the Merc 90 Fourstroke, which is the identical weight as the Honda. The nice thing about this engine is that it is 2.1L (compared to the Honda 100 at 1.5L -- or 40% more displacement), so should have good torque in the mid-range.

If you are daring there is a 115 HP version of that same Merc engine at the same weight (but I do not recommend going over the max hull rating.)