I'm sticking with 5 shams for pvp... I have 8 accounts now, so I'll lvl 5 shamans together.
Then my pve group will be pal,boonkin,shadow priest, resto sham, ele sham. (Then 8box for 10man content unless it is ubr hard, then it will be me doing pal + 4 shamans when I 5 box in 10mans).