The Japanese Sigma's are the best and some of the Korean are pretty good (DR-28,35,41 and 45) also the DM (Mahogany) withe higher numbers ie. DM-5 is better quality than say a DM-4 and so forth. The Taiwanese or Indoniesian are all of lower quality than the others. They are the later Sigma's and most are DM-1 status which is the lowest quality you can get. If you want to have it as a collector guitar, but the Japanese models. If you want good players, also Japanese but lots of the Korean made sound very good. The older they are (aged) the better they sound.