The legendary chest seems like a great deal (even though the weapons aren't particularly my cup of tea). The skin is an interesting pick, but other than that, what are you gunning for?
new xpac changed the dailies to a semi-seasonal system where one of the rewards you can choose is a legendary starter kit. you can pick a precursor from a small selection and one of the expensive gifts to get a headstart on crafting with.
Not from the gem store, the Wizard's Vault. The daily system has been replaced. Currently there is an option to buy a legendary starter kit. It contains a limited set of legendary sets (there's only 4 to choose from), that give you the Precursor weapon, the weapon specific gift, and a random Gift of Might or Gift of Magic.
It's a really great boost for crafting a legendary weapon and worth grabbing. I'm now about 500g away from my next legendary weapon and I literally just finished one a few days ago. It's going to take a while, but it's exciting stuff!