Just to clarify, the front of the Sigma doesn't rotate either so you are OK using filters like polarizers. But, the change in length as you focus can be annoying.
The 40D is the superior camera. If you can get a Canon-authorized refurbished 40D *with warranty* for the same price of an Xsi, I say go for it. Canon is very thorough on their repairs. They seem to break it down and fix everything whether you ask them to or not in my experience.
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