^^ ganja_man has it spot on really, the answer will vary greatly based on the exact needs of whoever is answering. And going for a cheap one definatly wont leave you happy, but that doesnt mean you need the most expensive one either, do your research on any that your interested in. Also I would HIGHLY recommened getting one that allows you to change the temp, I constantly see people saying the high isnt as good and stuff with vaporizers as it is from smoking, most of these people are using cheaper ones that you cant change the temp on, and they dont seem to realized that the other cannabinoids have different vaporizing temps than thc does, so to get the full effects you would get from smoking you will need to set the temp higher than most are preset to get the thc