I like the new Rams... that is a much more pleasant color scheme.
For the Broncos, I wish that stripe remained as thick as the back of the helmet, instead of coming to a point near the front. But the new one is much better.
Old Pats, sorry... the new Pats is much more streamlined and is easier on the eyes.
I'm not sure about the Titans... I mean, you're comparing the Oilers and Titans... different nicknames call for different logos.
You forgot the Chargers... the 2007 scheme is hands down the coolest (especially without the numbers).
Of course this is coming from a guy whose favorite helmet has no logo. :)