I don't use a 20D, but have printed an 8x10 from my D70 Nikon which comes out really good. At 3504 x 2336 pixels for your max size you should be able to get an 11x14 no enlarging required... At least this is what my Nikon manual tells me. maybe someone who owns a 20D will answer soon.

"The happiness of a man in this life does not consist in the absence but in the mastery of his passions."