World Of Warcraft: which pet to buy.?

Not sure what you mean at the end about using the celestial steed on n off? You can mount whatever mount you have available, just add it to your GUI... The celestial steed can be used by all your toons, there is no code for it, it will be mailed to you In game, to all your toons, on any server. I have 15 toons, paid for one celestial steed, and they all use it. As far as the pet, i like the moonkin, but i think im biased due to druid being my first toon. the Panda would be cool too I think...