If you plan on doing power addres down the line (supercharger, turbo etc) you may want to think about adding 3.73 instead of 4.10 gears - even on an automatic.
I have an 08 auto and did 3.73 and have a supercharger. You really feel the different w/just changing the gears though.
I had a diablosport intune tuner - it was great - loved the custom tunes and free tunes for life. But when I did the supercharger the installer changed me over to SCT because he had all his custom tunes on that brand.
As for CAI...not sure. I went cheap and got the Stack Racing CAI. I didn't notice much of a difference - it's more the tune/tuner.