I think there are two or three distinct advantages to learning the Barrios: it's written for guitar, it's in a key we rarely utilize, and it's not as well-known as it should be. It's also a RH pattern that will really help balance out your hand, and it's quite a bit shorter. Well, that's 5 advantages, on top of which it will prepare you for the Bach! Imagine playing the Barrios and Bach together as a little set, could be quite charming.
Lester Devoe Flamenco Negra
Lester Devoe Flamenco Blanca
Aparicio Flamenco Blanca with RMC pickup
Bartolex 7-string with RMC pickup
Giannini 7-string with Shadow pickup
Sal Pace 7-string archtop