Depends what you wanna play.... Personally I like G. If your playing covers figuire out what key they are in.
you know that when playing blues etc, the key you play in is actually a 5th away from the key its in. Like a C harmonia plays in the key of G. if you play lots with guitarists, id get one in A or D,
Well if it's your first time playing, I'd get just the one, and if you get into it, you'll eventually wanna get most of the keys....
full sets arnt that expensive, like $30 on musicians's friend, granted they arn't the best quality, but still
Yeah man, here it's like 25quid for a single harp. 30quid might get you a real bad set, but I'd reckon your better getting one or 2 good ones than half a dozen ones that screech.