Integrated with A/B Speaker Switch

I'm helping a friend put together a home system which is a bit complicated - existing home system is a receiver going into a impedence correcting selector box that supplies built-in speakers throughout the house. New improved system is a pair of Soliloquy 5.3 speakers and needs better quality amplification than the whole-house system. The most elegant solution would be to find an integrated that can look into 4 ohms with an A/B speaker switch - the A would go directly to the Soliloquy's and the B would go to the receiver. Any good candidates?

Another option is to get a preamp with two amplifier outputs, and use it to control the amplifier section of the receiver as well as a seperate amplifier for the Soliloquy's. But I'm mostly asking about the first (A/B) option.

Thanks very much. Peter S.