You write "Choosing the brand is important now because I plan on building a lens collection that grows over time."
I couldn't agree more. Any lenses you buy after the kit lens are likely going to outlive your initial choice of body so providing the initial body is good enough the lens system is the critical choice.
Gordon does great in depth lens reviews but obviously doesn't have the time to test them all so if you want a good overview of the Canon range you could do worse than visit
http://www.the-digital-picture.com/Reviews/
Bob.