Question about harp keys

[crawford@xxxxxxx]

     A fairly basic question: I'm learning to play by listening to 
     tapes (Jimmy Reed, Slim Harp, Little Walter, SBWII, etc.). I 
     have four harps, C, D, A, B flat. I'm trying to buy harps 
     based on the most common keys for playing the blues. Any 
     suggestions on in what order I should continue to buy harps? 
     And should I go for all 12 keys before I spring for an amp? 
     By the way, I really enjoy this list. I'm saving the 
     technical stuff for when I can use it. Thanks. 
                            Charlie Crawford crawford@xxxxxxx