I think you should fly out to both places, they are extremely far away cities... don't know about prices. But I know the cheapest air-deals you can get from Gol. If not check out Aerolíneas Argentinas or Lan.
Been to: Argentina, Chile, Syria, Lebanon, Israel, Palestine, Jordan, Egypt. Greece, Turkey, England, France, Italy, Germany, Austria, Belgium, USA, Mexico, Spain, Monaco, Czech Republic, Ireland and Uruguay.
Next trip: Still pondering the possibilities for January 2009... * OH THE MYSTERY!! *
The travel bug is insatiable