If you could have 220V for your tank, would you?

[Delphinus]

Building my tank room, just wondering if I should string up a 220VAC circuit. The only things I have currently that could run on 220V instead of 120V is the halide ballasts (multi-tap). About the only advantage I could see is that the amperage draw is half since the voltage is double, but what is the real advantage to doing so? It's not like the energy consumption is reduced, I think it's just a loading issue. Plus I imagine that a 220V circuit takes up at least 2 slots in the breaker panel, so I'm sort of wondering if it's even worth it.

In a perfect world, would you want to have 220V available for your tank?