Pally with druids, or shamen?

[Gearboxx]

I have decided to start a 3man PVE group! I was looking for some advice on group composition because I have rerolled twice and cannot make up my mind!!!
Paladin tank is a no brainer for me since my warrior tanking skills are atrocious, but here is where there is some debate...
Do I use two druids or shamen for support. currently I am using two druids but was wondering which group would be better equip to handle instances?
I liked the druids for the HoTs and innervate but totem envy is starting to get me.
Another thing is I have never played a shaman before so I'm not exactly sure what I'm missing out on.
Any opinions/experiences are greatly appreciated.!

Thanks!