I had a similar situation. I had a 1D and a 40D, and the wife really started getting into photography. So I gave her the 40D/17-55 IS combo and after a day, she told me that it was too heavy for her and gave it back. She went back to using the G9.
My advice would be to hold off for now, give her the 20D to try out and see if she gets bitten by the bug.
She know's it's heavy, but she's a tough broad and actually thinks the XSi is too light/small/plasticly. She's not a big woman either, but she is so used to my bodies (Elan and 40D) that she really loves the sizes.
For the OP, I'd say give her the 20D and get the 50D for your self. People are really on to something by checking with her to see what she would want.


