I have an old Life-Link shovel. Plastic blade and aluminum extendable tube handle. Check out a good mountaineering supply store and they will have a couple of light but strong shovels.

For igloo building you may want to have a snow knife or saw too. A curved shovel can be used to cut blocks but a flat knife or even a ski is way easier to use than a shovel.

I have not used that Snow Claw, but I am guessing I would want to try one before buying one...it seems a bit limited to me especially for snow caves or avalanche digging.

I always toss my shovel in the car trunk in the winter...excellent for digging out or tossing some sand under the tires.