The Chieftains - which CDs have the best sound?

I have a few CDs of the Chieftains and love their music. The only one of mine that has truly good sonics is "James Galway & The Chieftains/Over the Sea to Skye," RCA 60424-2-RC. I'd like to get more of their stuff but, audiophile that I am, prefer to get the better sounding ones. Please recommend any that you know of that really sound good, or those of other groups that do similar Irish music and are especially well recorded. Thanks.