I'd go with a fourstroke. Suzuki & Merc both have 250 4S engines. MUCH Quieter, more efficient, for 8-10% more $$
If you go with a single, take a kicker, too. Or get SeaTow
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury