I decided to check out eBay and ran across the BBK series of bags. They have a similar look to the Belstaff, but have inserts for cameras. Also, the BBK4, the largest version, was less than $60 with the insert. Seemed pretty reasonable and I may actually buy a smaller version of the bag if this one holds up for a while.
While I will mainly carry this with a 24-105mm, 70-200mm, and an 85mm with a camera body, I decided to load it up to see what I could fit if I needed to:
100-400mm (with case)
5D Mark III
iPhone (for Eyefi card if I want to store pics on the 64GB iPhone)
iPad (if I want to see photos on a larger screen)
1.4x and 2x teleconverters
The case comes with a piece of padded material that can fold over the inside of the case for added protection. It also has a couple internal and 4 external pockets.