Level´d my Warrior as Arms. Will stay Arms. Prot as second spec. Just because of WorldPvP, mass-mob-farming and Elites-soloing. I just don´t like fury. Main Lv 110.
Level´d my Druid as Kitty. Will stay Kitty. Maybe Guardian as second spec. Im not into healing and was never even decent as boomy. She´s Lv 104 by now.
Level´d DH as Havoc. Will stay Havoc. Maybe get into Vengance by time. She´s 103 by now.
Level´d DK as Frost. Will stay Frost. Maybe try the other specs at 110. She´s 103 by now.
Level´d Hunter as Survival. Will stay Survival. Maybe BM as second spec, because ofdamage and RP-Lore of my char. He´s 104 by now.
If i´ve got enough time I will level up everything else. With most I will stick with the spec, because i choose before i play the toon long enough. Sometimes just for Rp-reasons. i don´t like that "but spec-X does way more damage/ is a better Tank"-stuff. Even if i´m somewhat shitty with the spec i choose, it has to be fun
That said, you should play what you like. I can recomment bear and kitty so far. But mure kitty, because "purrrrrrrrrrrr".