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First off, I do not know of any big multichannel amps with a subwoofer output. You need an AVR or a preamp/processor coupled to a multichannel power amp. If you are committed to stereo plus sub, look at the Harman-Kardon HK-990 http://www.stereophile.com/content/harman-kardon-hk-990-integrated-amplifier
I am surprised that you have dismissed AVRs as there are several that should easily drive your LSi9s. Be aware that, since all the amps in an AVR are running on the same power supply, maximum output per channel must vary with the number of channels being driven. OTOH, since the multichannel signal sources never drive all the channels equally loudly at any time (except during testing), the 2 channel or 3 channel ratings are probably more representative of how the AVR will perform in your system.
Also, bi-amping will not be of any signficant value in increasing power output. If your currrent amp or AVR is inadequate, just get a much bigger one.
Kal