My sister is in her second year of architecture. She is in need of a camera, she says everyone else at her school has the canon XTi rebel. So i am thinking of purchasing this brand, but i do have some questions. I am finding that i can get different types of packages off of ebay that come with flash, extra lenses, bigger cards and some extra gizmos. I'm curious as to what would be the best bang for the buck as far as extras. What do you think an architect would need?