Have you had a chance to compare them in the flesh? If not you may be astonished by the size of the D70, it's a behmouth! I myself felt a bit overwhelmed by all the dials and buttons on the D70, I like a bit of control but it just looked to be too much. Another factor in my decision would be that I have Pentax glass already, but I still wanted to check out the Canon and Nikon for comparison. I think you should play with them both in person and see for yourself which you would be more likely to use. Oh, and if you can, download the owner's manuals for both and give them a look for features and functions. I think the batch of consumer DSLR's are very close in picture quality so you really can't make a bad choice.