what you do is get a decent condensor mic and a sm 57, and mic the acoustic guitar, you get the best sound that way. there are plenty of articles on the net that tell you how to mic guitars. this is the same way with electric, you can, (mainly for cost reasons) just go straight in to a recorder, but are suppose to mic the amp wit like a sm 57 and have a condensor farther back to get the acoustics of a room. my boy has a rock band, we went both ways, straight in to the recorder make the guitars sound thin, but from an amp or when you mic the guitar, they sounds thicker, richer and warmer. so i would say straight acoustic and mic it!