I really don't understand much about the pricing because my corolla was a birthday gift from my parents but the 2011 models are kind of ugly and wired looking and if you can you should get the 2010 model s or xrs I don't know whats your preference.
and if you say that the property tax you have to pay will be paid on 2012 you should go for it, but try to get a better deal $19,700 because is an old model even though is a new car.
I know that I didn't answer your question in full aspect but that is my opinion