Just bought the T3 a few days ago, but saw today the T3i is on sale. Am curious as to if it is worth exchanging and paying the difference of $150? I know the T3i has a better sensor and an automatic sensor cleaner. But I am unsure if this (and other stuff not listed) is worth the money. Hoping any camera nerds can help me out. Thanks. EDIT: Another one I am thinking about is the Nikon D5100 which would be a $100 difference.