Salty Ross,
If you are talking about an airbrush, get the best on you can afford. Iwata
seens to be the brand of choice for a lot of the guys, but don't count out Badger or some of the others. As far as spraying vinyl, make sure you thin it to about the consistency of water or you will be spraying spider webs. I havn't found clogging to be an issue with vinyl.
TJ