I like the plastic comb; Special 20 is a good all-purpose harp. I play guitar and harp (keys A,C,D,F,G): country, folk, blues, pop, Cajun and zydeco. Eventually I blow them out and have to replace them. I understand they can sometimes be repaired, but I've never been good at it, so I look for deals -- buying the package of 3 saved about $15. Cheaper harps aren't worth getting.
Andy, The Porchdogs