Hi Cy
Conscious this is an old thread, but here is my view being a D7100 user.
I got the XT1 with the 18-135mm WR lens recently, because:
1. it has weather proofing vs the XT10, not sure if this is an issue for you, but I travel a lot.
2. Felt more solid and secure in hand - 5'10 so no giant hands
3. After rebates over Xmas in the UK, the difference was worth it both from an immediate and a resell perspective.
4. This body felt better with the bigger lens on, abalance thing - which will depend on your hands and shooting style.
5. Lenses are smaller which is really useful for me - especially the prime 18mm, 27mm & 35mm V2.
On the system switch, though I gave up an awesome camera:
I use the Fuji more. Did a 10km hike yesterday and hardly felt the weight, even with a ergonomic speed-strap, I always felt the D7100 an encumbrance (note: I am not a small guy).
Not having a second card slot is a factor, but not an issue so far.
Hope that helps