I was looking at the Talon Air Ride system for the 3500 that I plan on getting in the next month or two. Their kit is about $3700 for the entire rear setup with self leveling system and compressors and also includes the setup for the front suspension. Here's the link...

http://www.stengelbros.com/Talon%20Air%20Ride.htm

I looked at the Talon before I went with Kelderman. It looks like a cool setup. If I remember right they didn't offer a front setup for my truck.

I saw that they only supported up to a 08' model, but is there any differences between the 07/08 and the 09's, as far as suspension goes?

Couldn't tell you, but I bet that there is no difference.