I just looked at the CP gun you linked. It looks decent from the photo. Much better than the cheapo CH my buddy had. If you get it let us know if it is any good. I will say that the Devilbiss finishline got recommended to me by prof. body guys on another forum. I think they told me to get a Finishline II or something like that.
You do know that you also need some kind of water seperator, right? Otherwise you will get water in the paint causing poor results.