The Nikon / Canon debate is always a difficult. I made the decision to go for Canon quite a few years ago - I looked at friends cameras and in shops and decided that Canon was the one for me. At the time the controls and thinking behind the Canon seemed more user friendly and the performance for the money was better.
I've been impressed with the D70 pictures on pbase - but I'm also impressed (and totally in love with) my Canon EOS 20D!
All I can suggest is that now you've used the Nikon go to a shop and look at the Canon models as well - it would be the EOS 350D or the EOS 20D depending on your budget.
The main thing is to swap to an SLR - as Ray says it will change your life! I'm sure whichever you choose you'll be delighted (and also forever poor as you add to your lenses etc!).
BTW It looks like you've got all Canon users replying to this thread - so we're obviously friendlier!
Ric