I wouldn't use a single stage paint because it won't be the right consistency for striping. If you want to use a catalyzed paint and clear over it, I would use either HOK or X-Otic pinstriping paints - they are both good.
That being said, the majority of stripers out there still use one-shot which works very well. You do have to be careful when you use a catalyzed clear over on-shot though or you can just melt it all off.
Also, go for the xcaliber brushes - they are worth the money!
JP