Depends on what you want to do and what your budget is. For me it was mostly PVE/heroics- I rolled 4 shamans for similiar reasons, then decided to go full out with 5 and the only thing I regret is not rolling 5 from the very beginning. Occasionally I will drop a toon out in place of a RL player and wow... what a difference. It's actually harder to do heroics with real people.