I'm in the market for another digital camera. I have no compatible lens. I currently have a Nikon 5000. I used it on a professional job outdoors and I feel I need to move up to one of the 3 cameras mentioned in the subject line. I was pretty set on getting the D100, but two things caused me to reconsider. One the D100 does not have a ISO 100 equivalent and two I don't know how big a problem that dust particles on the CCD will be.
Did you notice any additional noise between the Nikon ISO 200 photos and the ISO 100 photos from the D60 and the S2? I hate to put you on the spot, but it's not likely that other members will have been fortunate to have tried all three makes.