Do you prefer instrumental or vocal, slow or fast, very traditional or somewhat modern?
I like a lot of 'em, actually, but just ordered Shantalla, Patrick Street/Compendium, and The Bothy Band/Live in Concert. (Three CDs is a major splurge, but I still have a TON on my wish list, and for $7, I can't help it!)
You can listen to a LOT of their albums (full albums, not samples) online here.
Whistle Note: OT, this would be a GREAT time to pick up Joannie Madden's CD ("A Whistle on the Wind")...it's a good 'un!
I've heard cuts from it on Spinner.com. I'll look into it as soon as I get on a computer with a soundcard.