Just get the '05. Of course, it's not one year newer, but they're plentiful. And you can get them a lot cheaper than an '06.
If the '06 came with the same rear end as the '05, I'd want to get the '06 as well. I'm just not fond of the way it looks. I think the only option that's on the '06 that I like is the VSA. I don't care for the other changes.