Hey Chad, that's a nice setup.
I just purchased some booties a few days ago from feathered friends. They aren't the lightest or cheapest, but they are mid calf height, and have a removable shell. I felt this would be a great feature when tramping in and out of your tent. It sold me on them. From my research, the Nunatuks are probably the lightest booties you can get @ ~4-5 oz depedning on your foot size. But there is still the 6 week build time required for them, ankle height, and they cost $109. My local outfitter, www.mec.com , has down and synthetic booties both at very good prices (under 40 bucks or so). My logic for the FF was that I could walk around in camp, get the shells all cold and icey, then slip them off and go to bed with my down liners if required. Unfortunatly, I don't actually have them yet so I can't give you a review, but I posted about them a few days ago in the g-spot. People seem to be very happy with them.
I have the snow claw. For winter backpacking, it is perfect. I use it to clear areas for my tent, build shelves and seats, sit on it, and cook on it. However, you mention you want to build snow shelters...the actual act of shoveling: picking snow up with the shovel and walking to another area to place it, can be quite tiring with the snow claw. So, if you have several hours of shoveling to make say an igloo, I'm not sure it would be a good pick, but it can be done. A snow cave maybe not so bad but I haven't done it before. Voile makes a one pound shovel called the XLM. It sells here for $40 but it still has a short handle.
Maybe you need both? :)