Personally, I think your best bet would be the 200 hp Yamaha four stroke 4 cylinder that weighs in at 480 lbs, followed by the 175 Yamaha, 150 Yamaha/150 Mercury. The V20' s seem to operate best with the 150-200 hp range. Some have higher hp but raraely take advantage of its performance. If you are running in salt water, I cant recommend a Suzuki, they build good engines, but their aluminum doesn't hold up well. They have suposably improved their aluminum. The Honda engines aren't even close with weight, price, performance or holding up to salt. Surprisingly, the etec engines offer very little advantage in weight savings over the four strokes in the optimum hp for a v 20. I cant speak for their reliability as there are so few in this area that I have no experience with them. If you are considering buying new, my suggestion is to find the best dealer that you'll be dealing with, and see what options in engines they offer
Dry weights
F150 thru F200 4 cylinder Yamaha 480-491lbs
3.3 V6 Yamaha 200/225/250 602lbs
4.2L V6 Yamaha 250-300 571 lbs
Mercury 150 4s 455 lbs
Mercury Verado 175-200 510 lbs
Suzuki 4 cylinder 150, 175, 200 530 lbs
Suzuki 4 cylinder 140 395 lbs
Johnson Evinrude small block etec 150-200 500 lbs
Jonson Evinrude big block etec 200-300 507 lbs
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