Offered a decent deal for a Canon XTi, I can get the body only, or the 18-55mm lens with it for $55 more. My question is, should I go for the combo or is my money better spent buying a different lens. I'd like to keep the lens around $100... I know, that's probably asking the world, but I'm new to the game and am not ready to drop $500+ on a lens. Any other suggestions are welcome.