I thought it would be a good idea to list a couple of suggestions for wines that are solid performers in the price bracket of USD15-20ish per bottle. Im setting the upper price limit at AR$65. I will list a few labels in each major wine category:

All prices in AR$ (pesos) per bottle, current as of 03/2008** - current FX rate is approx. AR$3.18 = US$1.00

Sparkling Wines:
Ernesto Catena Alma Negra Espumante NV / AR$65
Baron B Extra Brut NV / AR$49
Baron B Nature 2004 / AR$60
Cruzat Larrain Brut NV / AR$60
Cruzat Larrain Rose NV / AR$65
Cruzat Larrain Nature NV / AR$65

White Wines:
Clara Benegas Chardonnay 2007 / AR$32
Rutini Colleccion Chardonnay 2007 / AR$56
Lavaque Quara Reserva Torrontes 2007 / AR$39
Banfi Cinco Tierras Torrontes 2007 / AR$40
Escorihuela Gascon Sauvignon Blanc 2006 / AR$38

Red Wines (varietals):
Juan Benegas Malbec 2005 / AR$32
La Azul Malbec Ed. Limitada 2004 / AR$49
Escorihuela Gascon Cabernet 2005 / AR$43
Ernesto Catena Tahuan Malbec 2005 / AR$55
Ernesto Catena Tahuan Cabernet 2004 / AR$55
Benegas Sangiovese 2005 / AR$65
Benegas Syrah 2005 / AR$65
DV Catena Syrah Syrah 2004 / AR$50

Red Wines (blends):
La Azul Reserva Blend 2004 / AR$75
Escorihuela Gascon Syrah Malbec 2004 / AR$40
Don Tiburcio Benegas 2005 / AR$40
Rutini Cabernet Malbec 2005 / AR$55
Viña Qaramy Pachahuasi 2005 / AR$55
Domaine St. Diego PuraSangre 2003 / AR$65