Lexicon RX-7 vs ATI's AT2007

Hi all,
Needing a little guidance...

I'm planning on wiring a few rooms so that I can install 2 or 3 speakers in each and have them all run off the same system. I'm looking at either the Lexicon RX-7 or AT2007 to power 7 Totem speakers (either the Mask or Tribe... depending on what my wife will let me buy.)

Does anyone have any thoughts? I'd be picking either amp up second hand, each for about the same price. Only difference is that the ATI would still come with a warranty...

Thanks for any thoughts!