I think I am going to be upgrading to one of two cameras I am looking at. I'd rather not discuss where they are for sale at (both local brick & mortar stores), as they are available in limited quantities. My current camera is an EOS Rebel w/ 18-55mm lens. Here are the two setups I would like to upgrade to: D70s w/ 18-55mm lens (used) OR D50 w/ TWO lenses.. a Tamron 28-80 and a Tamron 70-300 Macro (factory demo) (Both prices are similar, and I can afford either) Which one would benefit me most? I like taking nature photography and some macros, which is why I am leaning towards the D50. Are factory demos bad? How different is the D50 and the D70s? Thanks!