i'm buying a dslr and could use some advice. Money is an issue and to get a decent camera i've decided to buy used. My choices are, as of now, the refurbished canon 450d (xsi) for $480 or the canon 20d in very good condition for $500. I would be putting the same glass on them, the 18-55 is lens. help would be greatly appreciated. These prices are with lenses included.