I am a big advocate of Meguiars' products. I use Meguiars Ultimate Polish, Wax and Detail Spray to keep my Challenger looking like new. Check out the gloss on my 2009 Hemi-Orange Pearl SRT.
One thing that amazes me is how durable many paint finishes are to the elements of being parked outdoors continuously.
My paint looks so good because I keep a Covercraft car cover on it. Unfortunately, my garage was converted into a 4th bedroom years' ago.