I like this one, as when you are in a huge white out, it's as if you are in a bubble, the only "restriction" being that breathing is not the old in/out we are used to. (In ferocious storms, earplugs are a good idea, too.) It's not cheap, but the particle filters placed under the pink cover are very cheap, and the carbon filters are useful for off-playa use such as when using spray paint or oven cleaning.
If you have serious problems with your lungs, there probably isn't a better choice.
I LOVE to go out in the worst of white outs and dig nature and, with almost total isolation from discomfort, watch people dealing....especially those trying to hold down their improperly made/restrained structures.
One could get a great set of goggles and an over the nose and mouth filter, but why not have one non-restrictive mask that does both? It is confining, and one doesn't want to be in it while dancing or in the tent, but when it's blowin' 30mph or more, WOW!
I carry mine in a small backpack, but under "normal" dust conditions use the great white 3M mask pasted into many of the above posts. It folds and fits in a shirt pocket.