Don't know if this helps or not, but I picked up a used Lowepro Photo Trekker AW II from ebay in nice shape and it holds all you are talking about and more. This bag is no longer produced and replacements are available which are similar in size and capacity if you are looking for new rather than used.
I wanted a used bag to carry a 500 f4 attached to a gripped 7D with an attached 1.4x, plus additional accessories such as a 580EX II flash, flash adapter, beamer, an extra body or two, 3 or 4 additional lenses, memory cards, both camera and flash batteries, cleaning supplies, etc. It also has a laptop storage area and waterproof cover.
Works great for my needs and the price was right on (< $100). In addition, its size is right for carry-on if you are flying.
Some of the newer bags can get a bit pricey, however they offer outstanding support, comfort, and capabilities...