You dont mention budget.
Mazzer Kony E would be my choice. I modified the top of my Kony E so it fitted under the kitchen cupboards. I dont think you can get much better. My Kony is matched to a Giotto Premium. I have no desire or need to upgrade. So it is a one off expense. I was advised that the grinder was as important as the Espresso machine.
When I upgraded from the Silvia and the Rocky I had smaller grinders in view, but I was glad I was able to make the jump.
Kony E is a magnificent grinder and as Mazzer grinders are in most coffee shops parts and service should always be available.
Just my thoughts.