I snap my photos with a Canon XTi. It was a toss up between that and the Nikon D80. I thought briefly about the Sony Alpha A100, but the lack of lenses busted the deal - the Image Stabilization would have been sweet, though.
Why the Canon over the Nikon?
Or maybe it's because I had a Nikon scope in my years before guiding and it wasn't great - it was just "ok."