There won´t be a default. Actual debt levels are low. Argentina will not be forced to pay, it will negotiate its way out. This has nothing to do with the current goverment. Argentina is getting backing from many important countries and sectors, because if they are made to pay something outragous this will put the entire financial system in "check mate" because renegotiating debt is a very common thing to do. The solution to this will be political. I wouldn´t worry about this.
If you are currious as to what COULD happen, you can talk to anyone who was here between 1999-2003. (I came at the end of 2002). Money will dry up, almost anything will become very expensive (bus rides, soap, food) and people will sell things at rock bottom prices to pay grocery bills. HOWEVER there is a big difference between 2001 and the current situation. 2001 happened after a decade of economic decline and rising debt levels and due to the pegged dollar to the peso, dependent on imports. Now there are few imports and most things are produced within the country. This would highly mitigate a default, as the economy is almost self sufficient. Also, the economy is in much better shape than the 90s (I know people complain about the economy now, but compared to the 90s there is no comparison).
Talking to people who were here in the 90s (ie, most Argentines), most could see the default coming, there were some obvious signs. I don´t see them now (banks offering plazos fijos at 30% monthly because there was no money in the banks). However, @gpop, this is not me saying that you should or should not buy a new car.