I'm thinking about buying a used 20D, 30D or 40D as a second body to go with my 7D so I can avoid some lens-switching when out shooting. I'd be interested in forum members' thoughts about which of the xxD cameras offers the best bang for the buck as a used-market buy, feature-wise and in terms of trouble/reliability. And maybe there are some other issues I haven't considered? I'm not leaving the 50D out of consideration, but prices for the older models seem mighty tempting. Thanks


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