Thanks for the advice so far. Joe - the prime sounds a good choice for birding/wildlife, but could be a problem for sports. I would probably have to take a second body with a shorter zoom on for closer shots, not sure that would work for me. (My back-up body is a 400D, so noticeably slower, with less capable AF) I might have a practice with 2 bodies to see how it feels.
Sassan - I agree about the 50-500. It's a cracking les for the money - in fact I have owned 2 of them. But when needing to zoom in and out rapidly, the huge change in length of the lens really affects the balance, and the weight of the mechanism makes it hard to do with the camera up to your eye handheld. Also a rather slow apeture for fast sports such as rugby and soccer on unlit pitches on winter afternoons.
I dont find heavy kit a problem to carry around - even my full kit load is lighter than the load for a rock climbing day, and much better than an ice-climbing trip!
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