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Ohms law states that a circuit with half the resistance will see twice the power. So from an economical standpoint, running your setup with a lower esistance will result in better efficiency for your money.
The drawbacks: More resistance means cleaner sound. Lower resistance means more strain on your components.
Personally, I'm running everything at 4 ohms- super clean sound, and my amplifiers are happy. It costs more- I pretty much had to buy an extra amp- but I think it's worth it.
You could also go down to one ohm mono on a capable amp. If you turned the gain down, it shouldn't be too tough on the amp. With the gain up, though, you could put too much strain on it and toast it.
Decisions, decisions...
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