Ohh the choices.. I get it! I'd hate to tell you how to go about doing stuff, so I'll try to give you some insights and options instead.
1) Do you play on a PvP realm? If yes: Wait till lvl60. Both horde and alliance hunters will want to camp for these beasts, make sure you're the last man standing, when it comes to taming.
2) You'll need instance runs to gear your hunter - No point in asking for best pet if you're not going to farm best pre-raid items anyway - Level your pets there. Make sure to tell the party beforehand, and also micromanage your pet to stay a fair bit behind the party not to aggro mobs.
3) Don't discard Owls. Although not considered "Best", it's a worthwhile contender. The Screech ability is a AOE debuff to Attackpower. It helps tanks survive in dungeons. When grinding, it helps build aggro on more mobs. In PvP it is more versatile then Broken Tooth, which is primarily aimed at interrupting casters. It can give you an edge against other hunters running with Broken Tooth. It's flapping wings can be an annoyance for players mouse-targeting, in PvP this is "Working as intended!! ;)", but some tanks might complain if they haven't key mapped next/previous target. On the topic of other pets, the Boars charge can also be a viable option in PvP, depending on your playstyle.
4) Serpents can push out quite a bit of staple DPS with out managing it's pacement. However it only increases the Hunters DPS, where Lupos AOE buffs Attackpower (mainly Warriors and Rogues). So in a caster heavy 5man run, you might want to bring a Serpent. And in raiding, if other Hunters has sorted the Lupus buff, you can easily go Serpent. But most raiding hunters, have Lupus either by their side or stabled.
5) With time, these rares will be less camped. This server has had a lot of exposure and a lot of people are busy leveling at the moment, this chaos will die out eventually. Sure these pets are exotic, but not a requirement.
If you ask my personal opinion, I'd say get comfortable playing your hunter at 60. Tame and level Lupus while Gearing up. Decide on a PvP pet that fits your PvP style. Hope this helped a bit, good luck.