If you only need a large can for this one trip, my advice would be to rent the Bearikade Expedition--after making sure it fits into your pack. Sure, it's spendy, but it seems many people have problems stuffing 6-7 days' worth of food into a "normal" sized can, and often resort to storing food illegally the first few days out--not a good idea. The Expedition is only 5 oz heavier than the Weekender, and the extra space is nice. Maybe it's me, but I also like having some extra space in the can after all the "required" food is packed to toss in a treat or two that don't need to be crushed...
My only complaint about the BearVaults is that the lids can sometimes be hard to remove--one big problem area concerns the latches that have to be pressed in to remove the lid. People have resorted to removing the latch tabs, but this results in a non-compliant canister, and bears know how to unscrew lids...
The pan/lid thing of the Big Daddy seems to be to be a bit of a gimmick, and unless they have updated it, the weights on the website don't include the lid/pan, so the combo is heavier than a BV500 + a lightweight pot. Also, when you are cooking your food in active bear areas, your canister really should be sealed, which using the lid as a pot negates, and I often find it handy to use the (closed) canister as either a small table or stool.
