I agree with Sydwayz on the 37 and Thirdchildhood on the 38.
If your talking about bigger seas you'll need an upper 30's foot boat for a better ride in the rough.
Razor's correct also, all the Fountains I saw showed noticably smaller than other Mfg's boats of the same declared size.
But, they were also faster than the competitors boats too.
I'd guess my 38 to be at least 10 mph slower than a Fountain 38SC with equal power. And their 38 was way way smaller in the salon and the cockpit.
Congrats on your upcoming purchase. Place pic's of any offshore power boat your interested in in this Forum and most likely someone will recognize the boat and perhaps know the owner. I always thought I might wear out my welcome with the boats I posted here while searching but everyone was always happy to assist. 2 of the 4 were members exboats with new owners or friends of members.
I passed on both instantly after speaking with the member who sold due to what I felt was less than desirable representation by the seller.
Like you are cosnsidering to do, I bought a sight unseen, except for internet pic's, unit based on a powertrain survey, marine survey, and a seatrial.
It was nervewracking for sure, because I had a major hull issue that the surveyor brought to my attention which was completely omitted by the seller. I was friggin pissed at him and used this to knockdown my purchase price for a huge discount but still inherited the problem after closing the deal.
WHATEVER you do, don't purchase without a survey and a seatrial. And with the high performance motors like your considering getting a Merc or Team merc approved shop to perform a powertrain survey also.
This is the best money you'll spend toward your purchase.