I'm going to agree with Jip with one exception...are you planning to upgrade to FX at some point?
I used the D7100 as my transition body where I started replacing my glass with full frame lenses in order to be able to go D610 or D810 later. If you don't see the need to go full frame later on, then I would take advantage of the smaller DX packaging and keep it good. As others have said, you'll see a slight up tick in IQ with that 24-85 over the 18-105, but then the loss of reach and wide angle will have you carrying both...and the 18-105 will win out for simplicity.
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