How will YOU utilize dual speccing?

I am curious how players will utilize the proposed dual-spec feature, and whether it will actually solve any role shortages. I envision the following uses:

1. PvP spec / PvE spec: min-maxxed to participate in all aspects of the game

2. PvE spec / Secondary PvE spec (different role): Player may have a main PvE role (tank, dps, heal), but selects a different role with second spec to help plug potential holes)

3. PvE spec / Secondary PvE spec (same role): player may just like one role, or is not a hybrid class, and will try out different specs depending on the expected PvE encounter

4. Grind spec / min-maxxed PvP or PvE spec: Player is dedicated to PvP or PvE, but uses second spec for grinding gold/dailies

5. PvP spec (arenas) / PvP spec (other): Player dedicates one PvP spec to complement a particular arena team, and utilizes another spec for another arena team and/or other PvP situations

6. Other?

Myself, I'm going with #1. But I'm curious where the rest of you will fall with all this flexibility. Perhaps we need more than one off-spec for those hard-core min-maxxers?

C