The other day I was on a flight from Amsterdam
to Dubai, and the Airbus A380 was doing 1076km/h over ground. Amazing.
The Mach-number was, of course, well under 1, we were helped by a healthy tailwind.
One can make 15kts in a bathtub if the current
is right :-)
I am more or less in the same position as the OP, and given the chance would likely look at a HR49 to live on and cruise
with, but alas, budget
falls short in my case.
It seems Jeanneaus of the 80-ies were well-built boats, and there are still plenty around.
A step up, there are some interesting Moodys, and a name I haven't seen in this discussion is North Wind
Amels are great cruising boats, but if, like us. you,like to cook, you may find the galley
on the Maramu and Santorin a little wanting.
I find it also quite exceptional if you find an older boat with rigging
that don't need replacement sooner rather than later, the cost of which is not insignificant.
Just some random thoughts,