Knomo bags too
I have a Knomo Saxby - very expensive, but extremely good, especially now it has stretched out a bit (always the mark of a good product). Though the Laptop pocket isn't especially well padded (I have my beloved Macbook Pro in a protective sleeve inside the case) but it is large and would easily take all 15" laptops slim or not. There are pockets galore, space for documents and small files, pen holders and enough room for all the mice, power cables and usb dodads you could want. Oh and the wax coated canvas material is water resistant and the bag stands up on its own when your laptop is inside it, which can be a real boon. It also offers a tracking service via Knomo.com if you lose it...
If I'm picky I'd say the bag takes a lot of stretching out before it's really useful, I would have preferred a bit more stretchy bag space for the assorted powercables I carry with me and the price is really very high for a bag, even if the quality is excellent.