Well, ideally I'd love to show the usual Greeks from Greece, BUT, we have equally talented folks here in the US. This is Apostolos Combitsis from an event he joined us in (Byzantine Choir of the Metr. of Pittsburgh) in Naples FL in 2007.
I consider this link as a perfect representation that is in line with the best of the previous generation of old-timers who were trained by the classic teachers and chanters. It's plagal second slow eirmologic but has enough sequential up-down through Di and Pa to be useful.
The ancient melody of "Agios, Agios" of the Liturgy of St. Basil is useful because the same melody is used both for English and Greek. On http://www.analogion.com/AgiosAgios.html one can find several examples.