sa imong question regarding IQ, basically the same.
if sa ergonomics, better to go to a camera store and try both bodies. choose the one that you like the most. but if you're planning to upgrade in the future, better get the d7100 right now ... don't mind the weight

maanad raka kadugayan.
as for sa lens, 18-300 cost you around 31k brandnew sa macys. but it's a variable aperture lens, bisan pa ug naa cyay VR, dili gihapon ka malingaw sa iyang 300 end.
how about u look into the cheap but reliable tamron 28-75. constant aperture cya ug 2.8 then it will only take 18k from your pocket.