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Based on my experience with the D40, you'll definitely want a camera with an anti-dust system. It's not life-changing, but it's nice to not have to take off the lens and use a hand-blower all the time.
Also, I'll contract my first response this thread because what I've learned here. The D60 might be something worth looking at because of the features it has over the D40 (more ISO selection and anti-dust, for a few things), but a D80, D300 or the forthcoming D90 is probably a better idea because you'll have a wider selection of lenses with full feature-sets. There will probably be some good deals on the D80 if you can wait until after the D90 comes out.
Also, I'll contract my first response this thread because what I've learned here. The D60 might be something worth looking at because of the features it has over the D40 (more ISO selection and anti-dust, for a few things), but a D80, D300 or the forthcoming D90 is probably a better idea because you'll have a wider selection of lenses with full feature-sets. There will probably be some good deals on the D80 if you can wait until after the D90 comes out.
Generally, Sigma makes all of their lenses available with mounts for all the major brands.btw. are there any decent SIGMA lenses as substitute for Canon lenses?
( I get a bit lost when looking at the SIGMA catalogue, can't make out what's for Canon cameras, and what's for Nikon )