I would have touched on this subject sooner but I left my ten foot pole in the other room....
With the exception of your enthusiasm and specific goals, it sounds like you have assembled all the ingredients to start working on that recipe for disaster of which so many speak. Knowing something about making coffee and opening a coffee shop are two diverse things. Is there any chance of getting a job at a coffee shop for six months or so? If for no other reason it will give you some experience as to what it takes to work a coffee bar from behind the counter. When you do open your shop you will have your hands full without wondering if the people you hare have any idea as to what they are doing.
Why not get a grinder that will serve your commercial needs now? I would not recommend either of those for commercial use. Any Mazzer other than the one you mentioned will suffice.
Without knowing the clientele or location of the shop, I would say that since espresso is the basis of the beverages that most folks seem to order in shops, and since espresso is the most challenging of the tasks ahead for you, that is where you should be spending the most time.
Do you have any business experience, a business degree, or anything other than enthusiasm to help you through? I am not criticizing, but just wondering what you are bringing to the table other than the goal of opening a shop in one year and the enthusiasm to do so. Partners? Investment capital?