And while we're on the subject of the Debreceni Református Kollégiumi Kántus (as it is known in Hungarian), their website boasts a number of excellent music files available for download. My own recommendations? Psalms 19, 46, 50, 65, and 114. The group definitely deserves more recognition on this side of the pond.
And one more: I have just received an email from Hungary informing me of yet another website in that country devoted to the Genevan Psalms: Psalms sung by József Dinnyés, as set to verse by Albert Szenci Molnár (1574-1634). After listening to some of these pieces, I would judge that the effect is remarkably similar to the late Burl Ives singing his well-known folk ballads. It's worth a listen for its unique treatment of these ancient songs.