Have an opportunity to get Rebel XS pretty cheap but already have 20D. Wondering if it is really an upgrade. 20D has ISO3200, XXD body and battery, 9-points-auto focus, 5fps. XS does not have any of these, but it is a DSLR that was realesed 4 years after 20D. I am just wondering if Image quality and noise characteristics of XS due to 4 years advancement makes it a better choice provided I can upgrade and not lose any money.


