It will be hard to screw up if you get something that Vape Giant sells.

If you want to get picky, find something that uses hot air (convection) to heat the herb, rather than just putting it on a hot plate (conduction). I know that Volcanos work via convection, as does the Vapor Brothers model. You'd have to check the rest.

To get even pickier, find one with a heating component that is ceramic, not metal. For a conduction vape, the heating component is a piece of something that gets real hot, then air is pulled past it. When the air moves past the HC, it gets hot, and then it heats up your bud. Some people are concerned about using metals because of the potential for metals to emit toxins at high temps. I don't know how well-founded that fear is. The Vapor Brothers and Volcano use metals.

There is a vape called a Silver Surfer that I've heard good things about. It's priced midway between the Vapor Brothers and the Volcano. Any of those would be great for you. Like I said, it's hard to go wrong.