US Dollars - when will it be cheaper?

Recently, i've been following the US dollar exchange rate. As we know that nowadays America is having economy crisis which affect many other countries, especially Indonesia. Today, 1 USD worth 12.500 rupiahs, few days ago it worth 13.000. In this two weeks, USD exchange rate is around 12.000-13.200 rupiahs, which I think is very expensive compared to few months ago which only around 9.000 rupiahs. I really want to buy some computer hardwares, especially harddisk because i'm still using old harddisk which can only hold 40GB. But unfortunately it's becoming unreasonably expensive. In March, you could buy an external harddisk for 350.000 rupiahs, but now the cheapest one is 575.000 rupiahs; around 200.000 rupiahs difference.

I really hope that next year the economy will be stabilized again, especially America's economy. I hope Barack Obama can suppress this issue.

Sources:
http://finance.yahoo.com/currency/convert?from=USD&to=IDR&amt=1&t=5d