I am new to Nikon rumours, but not to sound.
This may seem somewhat strange. But when using video, you actually do not need the autofocus at all.
Its very hard for the camera to know what it is that you want to tell. Whats the important element in your story, what to focus on and how fast etc.
Whats important is how nice the manual focus rubberwheel on the lens is to move. Fortunately Nikon has anticipated this in most of there lenses, making a nice big rubber grip for manual fokusing with almost no mechanical sound, except in some models of the 24-70mm 2.8
The ME-1 is no better or worse than any of the other microphones out there. (Actually a bit better, cause of no need of battery)
All you need this little mic for is sound good enough to sync later on with your even better external recorded audio.
Maybe the very good and very pricereasonable external recorder Zoom H4n.
So I would dive into the wonders of manual focus, and consider some kind of lcd viewfinder magnification so its easier to focus correctly, and maybe even some kind of focus assist wheel.
Oh, yes even more money to spend hehe. But start out with a fairly priced lcdviewfinder. Maybe like this one. (Havent tried it personally, but gets good recommendations and price fairly good.
Atb of fun in manual focusing.