I'll throw in my 2 cents.
Many of the customs mentioned will do an awesome job I'm sure but if you want to stay on the lighter end of the spectrum I've been pleased with my Kestrel Ovis Hunter. It boned out an elk and I didn't really need to sharpen it but out of habit I took it to the diamond card for a couple swipes before doing the second half. For weighing almost nothing I kinda like it! The next on my list is a lot tougher and made from D2 steel. It made it through a couple coues and an elk before sharpening. Jantz supply sells them under their Jantz pattern blades #45. It is thick enough to do some real work and still be fairly light.
I own a few full handle custom knives and while they are awesome for many purposes these are the two lightest fixed blades I have found that will break down an elk easily. I carry a scalpel and a couple blades also but just don't feel right without a decent size fixed blade in the pack.
Keep the pics coming guys, great knives come in so many shapes and materials its great to see all the different variations!