Hallo Bukko, 
Could It be that we are a bit of topic? 

Yes I agree with you there are a few very good ships with good dynamics for vsf. But for me It is also Importand to have some good areas with nice ports in a game, and thats the problem. 
It's "easy" to use dem-files and create a basic scenery. But to create a good looking scenery with harbour, docks, citys and all the navigation aids is very hard and time expensive. 
I am testing my Scenerys with the VSF engine. For this test I take also a look at the performance, I am using the the best ships for this test. I think Its important that we could use more than 10 ships in one area. 
I am not a good modeller, but I know how hard It is to create such scenerys beside the real job, familie and all other. So I think we need some professionals for such job. 
The Scenerys, ships and water from Shipsim and the open world with navigation aids from vsf- marine sim, I think this could be a good basic. 

Regards 
Thor