Which would be best for Rogue DPS, getting windfury totem or grace of air. My spec is combat daggers (15/41/5) and I have personally thought WF would give me more DPS at 70 considering we do more damage now . But a buddy of mine (also a rogue) says that I would benefit more from GoA so I am curious to get some other peoples opinions and possibly some math behind this.

You have no WoW Account yet you want to debate the effect of totems, interesting. You should also consider using the search button as you would have find a dozen threads like this one..

Anyway, in before the heap .

Extensively discussed in [Shaman] Melee group totem choice among others, and obligatory ib4tl

Not like this topic has ever ever ever appeared here before, remember search is your friend.

But fair enough - Here are two links that you should find reasonable answers to your question

Rogue DPS speadsheat thread

More specific on melee totems of choice

Ciao