I will probably need a new DSM someday.
Don't need a whole lot of bells and whistles.
My list is:
A few ZZ and deco stitches
Droppable feed dogs
Adjustable presser foot
Reasonable throat space
Built in walking foot function would be nice
Automatic buttonholer
aaaand the most important thing....
would be a needle threader because it's getting harder and harder to see that tiny little hole