i think just spec all same imo. my bro does 2x hunters and 1>60 he didnt really get chance to use any skills apart from aimed shot and arcane shot because he killed them too fast... with 4x hunters you will most likely get 1 hit killes all way to 60 if u spec marksmanship and have half decent gun/bow.

BM is the safe option, you know when u go into a fight nothing is going to go wrong, 1 bm pet is enough to tank 3 mobs 3 levels higher than u so 4x would be fun :P lol

survival when u hit 70? that is when survival really shines imo...

my opinion anyways ^^