Great information. Thanks everyone. I like Shadow Priests and uber-pure-DPS is not what I'm after. Main thing I'm looking for is nice versatile group. With my setup 2x spriests, elemental shaman, resto druid and tank warrior I get nice buffs, passive healing and enough DPS to handle heroics.

Druid and Warrior are going to be most focused characters. Those I also use to play with friends - either tanking or healing. So now I only need to level my shaman and second priest from their ~60 to 80.