Go for the 200. Some of the research I've seen is that the larger motor will actually get better fuel economy when loaded up, because it doesn't have to work as hard. They compared twin Yami's on a whaler 200's and then 225's and the 225's got beeter fuel economy because they could go same speed with less effort and/or fuel. I would think the same logic would apply.
There was a dealin in Bellingham Wa. advertising on E-bay for 2006 Yami 200's and the price was pretty good.
Good Luck