I'm just an enthusiastic hobbyist, but I'd like to have a backup digital body for my 7D, just in case, because I try to take at least a few pictures every day (I have a Rebel XS 35mm body that I'd rather not use). I'd rather not spend very much on this extra body, since I don't expect it to be used except in a pinch, or if I can convince my wife to use it instead of her P&S. To that end, I was thinking about picking up a used 20D, since they seem to be running in the $200-$250 range. My only concern is that the 20D is several generations older, and may prove frustrating to use after being accustomed to the 7D...but even the 30D is about double the price, used, which I can't really justify. So maybe that answers my question, in a way...so maybe what I really want to know is whether it's even worth having the backup body at all, if the 20D is my spending limit. Thanks for your opinions!