I am looking in to a used 20d from a person who is selling it w/o a scratch on it. Has 409 shutter articulations and comes with 4 canon batteries that are still in packages. He is also giving me a 550ex that is in good shape all for $500. What is your opinions about getting this to go with my XTi? I know that the 20d is basically a 30d with a smaller screen, lack of spot metering and a low drive mode. Is there any reason not get it? I have played with it and all works well without any problem I noticed.