I kind of have the same problem. I've always noticed my hands were smaller, or fingers were shorter, than what they should be for me to reach certain frets or chords properly. For a "spanish" guitar, I'm assuming you want a nylon string guitar? Those usually have larger necks to begin with. I have a flamenco guitar whose BODY is smaller/thinner to play that particular style of music, but the neck is still kind of large. Steel string guitars usually have thinner necks though.