I dont believe Karthik should be opening for India in the tests in Australia. You got to give thought to the opposition and the importance of the situation when the two got those runs. In Australia, opening with Karthik would be a big risk especially now when he is not in good form (he is going through a bad time in the ODI's which would surely affect his confidence).
I would go with Sehwag for one of the openers. And may be go with Chopra or Gambhir. I am also not pleased with Jaffer's erratic ways. he is not your solid opener, and is technically iffy. Chopra is the ideal foil for Sehwag. He can bottle one end up allowing Sehwag to free his arms at the other end. They proved lethal in the last tour of Australia and I have every reason to believe they can do it again.
I would go with Sehwag for one of the openers. And may be go with Chopra or Gambhir. I am also not pleased with Jaffer's erratic ways. he is not your solid opener, and is technically iffy. Chopra is the ideal foil for Sehwag. He can bottle one end up allowing Sehwag to free his arms at the other end. They proved lethal in the last tour of Australia and I have every reason to believe they can do it again.