Hiya Paul,
CV boots are a bit like buying a pig in a poke. Even the good ones can and do go bad. That being said, I would echo what MUADIB has already said, if there are no other issues with the halfshaft, go for the best quality name brand you can find.
Look inside your boot tear and check out the condition of the grease and the CV joint. If it is (in any respect) dirty or contaminated, pull it out and service it.
You might want to point your browser toward the Type2. com Tech Library for an article (with pictures yet!) on servicing those CV joints. Written for a Bus but still applicable to Bugs. Use only moly-based grease in the CVs.
And serviceing the CVs has to be the dirtiest, messiest job in all of VW-dom. Plan on tossing your clothes. A hint to help keep the grease in one place. When you grease your clean CVs set the CVs (on the half shaft) on a large piece of kitchen plastic wrap. Toss in the grease. Pull the plastic wrap up and secure it around the halfshaft. Now work the grease in and around the CV by manipulating the plastic wrap. You'll find that this is WAY MORE effective than doing without the plastic wrap. You can actually force the grease into the ball cage quite effectively. And you stay reasonably clean!
Mike
1970 Bus - The Ruptured Duck