Today I purchased part of my pack solution and I'm very pleased. I picked up the Mountainsmith cooler I mentioned above at EMS (which uncharacteristically had the lowest price by far!)
It fits my 8x10 Korona like a glove, I don't think you could get a better fit except custom made (big $$$)! The insulation provides just the right amount of padding and the whole thing is waterproof to boot.
Best part: $20!
I've ordered the backpack recommended by scootermm for his 7x17:
I'll update when it arrives and I put the 2 together add the nifty film holder bag from blaze-on and a couple of lenses and head out the door.