At 13 x 19", your pictures will be below 180ppi (13x19 = 160ppi). If you don't intend to show them
from very close, you won't have a problem. I have severals 10 x 8 here that I printed from my
former digital cam (1600 x 1200) but nobody noticed the difference because they're on a wall and the
closest people can get to them isn't close enough to tell wether they're seing pixels or not.
Btw, good choice on the camera. I have a 10D (almost identical) and it does wonders! A friend of
mine bought the 300D a few weeks ago. He's in love with it, although he said the supplied lense
isn't really good.
Also, you might check the files and see for yourself before you buy. Bring a CF card with you at
the store (if you're not buying online), do some shots, and bring them home.