Out of those guns, I would get this one
I have about the same size gun as that but it is a little bit "better".
The finished product with a gun will look the same as the car. However the catch is that it is ALOT harder to work with clear coat out of a gun then it is out of a rattle can. There are various problems you will have with clear coat if the surface is not prepped correctly. Also there are many other variables such as gun adjustment and air pressure that play an even bigger part in how your clear lays down. Being that the gun is small and would only require about 29 psi, it should work well with any compressor bigger then 15 gallons.
This is not meant to scare you but to give you an honest opinion. If you are willing top spend the $ for clear coat and paint, then definitely go for it! Revert back to this thread during your project for questions along the way!
Brian @Nexations Creations
Specialist in Custom Interior Fiberglass OEM Replication Work.
Play with it, 'til it's broke.
Those guns rock. I painted my first car with one of those earlier this summer.