Ok...I don't have my Digital Rebel YET. (not too much longer! I've almost saved enough money!!! ) But....I do know I will eventually want an extra lense or two. Here's the question...what kind of lense should I get? I will probably use it most for taking pics of people, but not nessacarily (sp?) just everyday run of the mill portraits. I also like to do the nature photography thing. What would be best for me?