Now that's what I'm talking about.... Nice set up!
I've been wanting to build up an ECR just like that - racks front/back with drop bars. I've come to find it pretty non-conventional that anyone runs drops on anything but mostly pavement bikes. I find my drops on my Disk Trucker a hand, posture, and otherwise general endurance saver to the point that's all I need to know going forward. If it works well already, why change?
In any event, the Troll, Ogre, and ECR are most excellent for multi-surface touring duties. I'd consider the Troll, but I want the bigger tire clearance the ECR offers. With disk brakes building up wheel sets for different riding conditions is possible. As has been mentioned in the thread already - a lot of people tune tires to where/how they ride. By swapping wheel sets you get the bonus of being able to change the rim width which in turn gives you another world of tire options.... Something for everyone here to think about, also. Yea, its more expensive, but less work to swap out wheel sets than swap tires on 1 wheel set. Again - with 1 rim width you are locked to a set range of tire size and what makes/models fit that particular size range.