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To elaborate further on this point, I agree with Joe that (assuming it is affordable) it makes good sense to get the F200 rather than the F150 if you are going the Yamaha route. There is virtually no weight penalty, and it offers 33% more horsepower. That is a BIG boost. If I'm not mistaken, it also gets you a higher output alternator (which may partially account for the minimal weight gain.)

The F150 (or better yet VMax 150) would be an option for those who are bumping up against the max rating of their hull. But an Outrage 20 doesn't have this problem.

In the Mercury line-up, the odd thing is that their 150 Fourstroke is a stand-alone model. There are no higher (or lower) HP versions of this engine. Unlike Yamaha (or Evinrude for that matter), to bump up to a 200 hp Merc requires a different engine series and a jump in weight. So the Merc 150 Fourstroke may be a best-in-class contender given its weight, power, and cost, but only if you are limiting yourself to a 150 -- in my opinion.