Considering purchase - questions on packages

Ok, so I am seriously considering trading in my 18mpg (sha, right!) rated truck for a Prius. I'm a techie nerd, so the Prius excites that part of me and I drive 60 miles per day in some fairly heavy traffic and would see some major savings in ga$.

So my questions... I am debating between the 2009 and the 2010. I am able to find a TON of info on the various packages for the 2010, however the 2009 package information seems to have vanished. Can anyone point me to a place that details which package is which in the 2009 line?

And on top of that, I am looking at various pictures of 2009 models and I see some with 1 screen and some with 2 screens. I assumed the one with 2 screens were models with the Nav system. However I've seen pictures with maps on the 1 screen models. What gives? I'm confused.

Thanks! Now if any of you can help convince the wife....