There are several threads that address this very issue so for more info you can do a search.

In general though the '05 and the '06 are identical as far as operation. I drove the '05 for a few months before I got the '06 and have been driving the '06 since. I have been getting better milage in the '06 but that could be due to knowing how to drive it better.

The '06 has a passive anti-theft system, the '05 does not.

The '06 has a few options that weren't available in the '05s. Both of mine are identical as far as operation and equipment level so I can hardly tall the difference except the '05 has a stereo I took out of my '04 when I traded it in. The stock single CD system sucks but only if that stuff matters to you. I don't have the Nav/Audiophile in either one.

If you can find a well equipped '05 and can get a good deal on it, you should definitely consider it, IMO.