Just want to add that I think the 300D (Rebel) is an excellent camera. It clearly has the same excellent image quality as the 10D for less money. In the hands of a good photographer the 300D will produce the same results as a 10D in almost all circumstances.

When I say I never have bought the 300D I am lucky enough to do it with hindsight. I have owned the 10D for a year, so I know which functions I would miss. If I hadn't owned a 10D my choice might have been different if I were faced with choosing between 10D/300D/D70.