The silithid is your choice if you want to keep an enemy stuck in place. It has a ranged Venom Web Spray ability which can do some damage and trap your enemy for 4 seconds every 40 seconds or so. Longevity helps with that, but to me at least it still doesn't seem as nice as the chimaera's Froststorm Breath. But it all depends on how you use it, I guess, as well as what other sorts of talents you choose for yourself. This is a Cunning pet, just the same as the chimaera.
BRK had a look at this a while back, which showed off the pets abilities and looks. There are four different colors, and for the most part, they can be tamed in Tanaris, Un'Goro, and Silithus.
The spider is your closest non-exotic alternative, with Webs that do the same thing as the Silithid but without the extra bit of damage.