Congrats on a very good decision. You can consider your grinder buying finished forever probably, and that is the heart of the whole operation. No upgradeitis for you in the grinder department.
I say get the stepless and figure out one time where the coffee grind setting works best, put a little felt marker dot on it and do the same for your espresso mark.
I had a stepped grinder and find a lot in between numbers that makes little differences that most don't worry about, but I do.
You'll spend a good deal of time looking at your dial and will probably make marks, or use little arrow stickers to know where certain points, like absolute zero are. (more on that later) It's all part of the fun and is very rewarding once you get dialed in to your commercial grinder.
I went further and took off the ring with the numbers, spray painted it the same color as the silver machine, and painted black notches carefully where the numbers are.
Unless you are changing multiple times a day, it won't be a hassle at all and the adjustment will be easy. 20-30 seconds of turning will move the grinder settings more than enough for both grinds.
You could always do like others in your situation and pull off the knob and replace it with a guitar winder which can be had for a buck or two. Once you do that, you'll cruise through the settings and probably enjoy your handywork.
The main point of the Macap, in my opinion, is the infinite adjustment of the worm drive and without it, you still have an awesome grinder for life, but might wonder how that shot would be in between two numbers.
In any event, nice job. It was fun to watch you wrestle with this and I can't wait until machine time comes.
