Are you more conerened about the cost differential or the hauling differential?
I have never been long term disappointed with buying good quality components or tools , and have been quickly disappointed with cheap stuff even if it was for "light" use
If cost is a concern, what is your savings if you do not use the nuvinci hub instead going with derailler shifting? (for the record I havn't quite "gotten" the desire for internal gears in that I don't have issues with classic gears, but I am probably not as hard core as many hear and never bike in snow)