Hey guys! So many of you know I recently got myself a Canon XTi kit and I've heard that the kit lense isn't exactly the greatest, so i was wondering in your opinions, what would be a good upgrade all-around lense? I'm looking to spend anywhere from 100-400 bucks on a good one. Any suggestions? Links? Also, if anyone wants to take the time to teach me about lens 'names' (the number/letter combinations) i'd really appreciate it!