you say that you are used to the 10-24mm focal length. GET IT! many will say to get the 18-55 for the wide to zoom, I would agree. But get the one that you are most used to as it is you who will use the lens, not them.
I know its unbalanced when you attach the zoom lens on the xt10, because its always on my camera than my 35mm and 56mm. I have no problems with it because its not much of a bother. I was thinking of the 23mm since I see that most of my shots are on the 24mm but I still prefer the versatility of the zoom specially when tight spaces are involved.