Since you want to lighten your load, I would lean towards disposing of the F5(bigger & heavier) and some of the heavier zooms, learn the discipline of working with fixed focal lengths for a while & then consider the larger camera systems. I would also get rid of the D100(personally) since Nikon will probably come up w/something new this fall. Right now there would still be a good market fot it. If you need the digi capabilities you can always scan the negs or have a CD made. So many choices, so many opinions