"Ideal" power for a 20' '87 Superfisherman?

[1a2b3c]

You guys are good! I appreciate all of your opinions...that's exactly the input I was searching for...of course I want the best of all worlds so the idea behind keeping engine weight down, fuel economy, noise and speed all matter...although top end isn't as important as I'm not much of a speed demon...nor do my Southern New England waters permit such speeds...I've been a Yami guy most of my life but am considering the 140 Zuke and the 115/150 ETecs...I've seen both makes for sale on-line for roughly the same price (approx $8k)...I think what will likely be a significant factor will be whether I have a local dealer/service provider for either...stay tuned...keep the opinions coming...all good...and thanks again...

p.s. If I do make the leap I intend to re-develop a rig along the lines of Mark's 20...with a few of my own tweeks to meet the specific needs of freediving/spearfiching...