I was in need of a new camera bag - my old one had reached its capacity, and I wanted to be able to expand. So while I was in the City yesterday, I went to B&H - http://www.bhphotovideo.com/ Not only was the B&H staff friendly, but they were knowledgeable as well. I was shown a few different bags and backpacks, and settled on this model from Lowepro.
Not only does this bag meet my needs, with room to spare, but it was over $100 less expensive than the bags and backpacks I had seen while browsing online the other day.
As I wrote the other day, http://365project.org/sharonlc/365/2011-03-11 , B&H is unsurpassed in Internet order customer service. However, there's nothing like a trip to B&H in person if you need some guidance about cameras and camera equipment.