I have 3 70 Hunters on the same server. Guess I can't get enough pets :).
Always been in small guilds, run heroics daily and Kara. 20 man specs arent really necessary.
Have Dwarven Survival hunter: No, not for PVP. I had a vision to have the ultimate CC Class / Spec. Pre 3.0, I was survival up to Wyvern Sting then BM for improved Health and Dodge and 5 in Marks for crit for my true CC spec. If i wanted more DPS I moved BM points to Marks. This gave me the ability to easilly CC 3 mobs on an initial pull (2 ice traps and Wyvern) And the ability to shortly deal with a 4th if i had to Deterance / Kite etc... Then add in engineering (frost / Concussion grenades, Gnomish Chicken) and a turtle pet that I could use with its shell abilty to tank even heroic mobs for 15-20 seconds with no heals. I had a lot of tools to CC 2-3 mobs for a long time. No this kind of CC isn't always needed but for the people who knew me they didn't mind inviting DPS Warriors and RET pallys for heroic Shattered Halls runs if I was on this toon. It's not about DPS for me on this toon, its about non stop action, running, kiting, trapping, amazing friends, working multiple mobs like a sheep dog on sheep lol. With WotLK, I speced to Explosive shot and as far as I could on the way to aimed shot. Now I get to DPS and do what I love :).
Have NE Marks Hunter: Chimera is very nice for sitting back and reacting to situations as they develope or just plain burst DPS.
Have Horde Troll Hunter: Was a BM Machine Gun Spec pre-3.0. I messed with Going 51 in BM but an exotic pet isnt that important to me. So, ill probably go 50 BM and pickup Aimed Shot or a 45 BM variant.
Sorry so long but, rarelly get a chance to talk about my survival hunter without being flamed lol.