another repower question...

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wondering if anyone has numbers for a f150 yamaha on an 18 footer. if not 18 then a 20 footer, weight not being all that much different. have been toying w/ a repower for the last year or so and can get a decent deal on yammis (relatively speaking anyhow). also, would the 200 hpdi just be overkill on that boat? i have an older 200 merc offshore now and have been spoiled by the extra power...any thoughts or ideas would be appreciated. i know there are not a lot of 18s on this website; if you have an 18 w/ any recent repower and could post any numbers i would greatly appreciate it. thanks