I hate to be the one to through you all out, but I own a Nikon D70 and a Nikon D100, and let me tell you
if youre willing to spend the money on a D70 (or even the D50), save a little bit more and spend it on the D100. The extra cost isnt a lot, and is well worth it. The D100 offers so much more creative control. The littlest to biggest things that you probably wont notice until you have them both in your hands to compare them. I bought the D70 first and then thought I should get a backup. The D100 was what I had in mind. I bought an ex demo model, for about the same cost of my D70, and let me tell you
Ive not used the D70 since. All my lenses from the D70 fit the D100, and my SB-800 flash also works a treat. Buying the D100 was the best thing Ive ever done for my photography career. I urge everyone with the passion for creating any sort of photographs to get one. LOOK INTO IT.