Congrats on the new RSX-S!
I'm in the same boat as you as far as needing a back seat for a dog (though mines a basset hound). I was really digging the RX-8 a few years back when I first heard about it, but once I saw pics of the interior back seat I knew it really wouldn't work with my dog since the center armrest console extends all the way back across the back seats. At least with the RSX's (cheesy) plasic tray in the middle of the backseat I can just put down a thick blanket...