In my opinion, you cannot beat the paragon slider option if you intend to use a Rohloff. Moots will even offer special braze-on option to handle Rohloff cable routing if you intend on ordering a new Mooto-x. I have a Rohloff on my commuter (Voodoo Dambala, a steel framed 29er with sliders). It has disk brakes and i use a speed bone to connenct to the disk tab. My Mooto-x has sliders but it is my race bike so I use standard derailleur (xtr 3x9) - I find it to be lighter and more responsive than the Rohloff but whether that is a reality or just in my mind is hard to tell.
I'm pretty sure Moots don't do an EBB option. I think they are far more prone to trouble than good quality sliders.
As far as fork is concerned, I run the Salsa cro mo on the commuter which is suspension corrected and will easily handle your weight without too much flex. That being said, it is a very basic fork and I wouldn't choose it for a nice ti Moots, preferring either a carbon or ti option (call me a bike snob). I run a Fox 100 RLC on my Mooto-x.