I mainly use zooms for other photographic applications however for portraits and pets I use 50mm f1.8. 50mm is about right considering the DLSR crop factor and equates to 75mm in 35mm full frame terms. Canon 20D has a 1.6 crop factor so a 50mm lens will be equivalent to 80mm. A fast lens is ideal for portraits creating an out of focus background using a wide aperture. I am sure Canon do a great 50mm at a very low price. I can only comment on Nikon where pricing is around £100-120 new and £50-75 used.
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