I use a Domke F-5XC. It holds my 7D with a lens and I can carry two more lenses and a flash if I want.
Right now in the bag:
Canon 7d with 10-22 EF-S on the body
Sigma 30mm 1.4
Canon 17-40 F4
Charger in front pocket 1.
It fits just nicely and it's not large at all. I do like those Thinktank Retrospectives but I don't have the cash right now for one, nor the space around the house for another camera bag...;-)