Legendary crafting order?

[Hauser]

I was lucky enough to get a gold Onyxia in an arena pack last night. I was wondering which legendary to craft? I am looking for one that can be used for multiple decks and that is not easily replaced with a non legendary or that has game breaking value.

I already have
gruul
leeroy
Naxx legendaries

I had a millhouse from my very first pack that I dusted a while ago because that card just seems awful!

I was thinking of these as possible choices.

Cairne Bloodhoof (http://www.hearthpwn.com/cards/498-cairne-bloodhoof)
Ragnaros the Firelord (http://www.hearthpwn.com/cards/503-ragnaros-the-firelord)
The Black Knight (http://www.hearthpwn.com/cards/396-the-black-knight)
Bloodmage Thalnos (http://www.hearthpwn.com/cards/525-bloodmage-thalnos)
Sylvanas Windrunner (http://www.hearthpwn.com/cards/33-sylvanas-windrunner)

[Ender]

It kind of depends on what decks you want to play for ranked. There are some really important class legendaries for some decks, like Grommash for a Warrior Control deck (although this deck requires other legendaries), VanCleef for the Rogue "Miracle" deck, Tirion for any Pally deck, etc.

But, I would start with the most commonly used legendaries first, which are probably Bloodmage, Black Knight, and Cairne. All 5 of the ones you listed though are pretty commonly used, so you can't really go wrong with any of them. Alextrasza is also really important, but can probably come after these others.

[Ender]

FYI for others, I would definately include Leeroy in that list with Bloodmage, Black Knight and Cairne as the most commonly used legendaries, but he said he already had it. Leeroy is used ALOT.

[Klaus]

Playing level 20-15 I see Ragnaros the Firelord (http://www.hearthpwn.com/cards/503-ragnaros-the-firelord) and Leeroy Jenkins (http://www.hearthpwn.com/cards/674-leeroy-jenkins) all the time.

[Trany]

I use Trion, Hogger and Rag in my Pally control deck.

[Klaus]

Love Hogger
http://media-hearth.cursecdn.com/avatars/80/566/39.png