I almost forgot, but regarding the power question, as you know even just a 3 db boost to the woofs will double the required amplifier power. You may need a bit more boost than that (3 db isn't much), depending on where the standing waves are in your room. If you are already concerned about the power sufficiency to the woofer towers of your 200 watt amp, I'll guess that 300 to 500 watts at 4 ohms may be required to get to life like levels, if you listen that way. I'll further speculate the Infinities can handle all the power you can throw at them.