Some other Argentinian Malbecs to consider:
Bodega NQN Coleccion NQN Malbec from Patagonia. I really like the structure of the Malbecs from Patagonia. As close as you will get to Cahors from Argentina.
Andean Vineyards
Alpamanta - biodynamic producer from the just south of Mendoza City. Tanzer scored the 2008 estate Malbec 89 and the 2007 Reserva 88 points.
In the past year, I have seen Malbecs from Chile at trade shows. Has anyone else tried them?