I have an Canon Xti, nifty fifty, lens baby 2.0, tam 28-75 f2.8, kit lens, and a 430 ex. I've convinced my dad to get me a lens for my birthday to take with me. What should I get - it can't be an outrageous price, but, he didn't ask how much it would run (and he knows they can get expensive) I'd like to get it somewhat soon so I can play around with it. -- I'll be going to Dubai and India if you were curious. Thanks!