If you really are comparing the D70 to a Digital Rebel, there's really no competition. From what I can remember, the D70 should blow the rebel out of the water. Also, the D70 is more professional-looking, if that matters. Right now, DSLRs are not something you can really dilly-dally around in, unless you own a bunch of oil rigs. I say either jump in head-first or stay out of the water (the D70 being head-first). You'll have to go with new lenses and accessories if you do pick the Nikon. However, they are great lenses, and if you do your homework you can pick out the duds from the studs.
In memory of Christopher James Roy, killed in action, November 28, 2005, and Eric Harless, taken by cancer April 29, 2006. We hardly knew you. May you each rest in peace.