Go with a single 250/300, and despite the value of SeaTow, (of which I am a member and have been since 1984), if you're running 70 miles offshore, put a 10hp kicker on that puppy. After all, SeaTow can break down, too, or be occupied with other assists, and even a little 10 hp kicker will bring you home in 10-12 hours.
Trust me on this. I've been there & done that.
Once ran home on a 15hp Chrysler kicker on the back of a 25' Robalo from Memory Rock north of Grand Bahama across the Gulf Stream to St. Lucie Inlet (62 miles), then down the ICW to Palm Beach Gardens (21 miles). It took 12 1/2 hours, at 90% of full throttle all the way, motor never even hiccuped.
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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
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