What's Google's (GOOG) next hurdle?

Google Inc. (NASDAQ: GOOG) hit $600, the latest of a long series of hurdles that skeptics including yours truly didn't think was possible. It's only a matter of time before they move even higher.

The company continues to chug along even in volatile markets. The stock is up about 30% year to date, eclipsing rival Yahoo! Inc. (NASDAQ: YHOO), which gained 9% during the same period, and Microsoft Corp. (NASDAQ: MSFT), which is little changed.

Interestingly, the stock didn't stay at $600 for too long, hitting a psychological barrier. Last I checked, the shares traded at $596.65. I think investors will soon get over their unease and push the stock even higher.

The question is how high? What's the next hurdle for Google? Is it $700? $800? $1000? Henry Blodget recently upset the Internet establishment by arguing that Google could reach $2,000 over the next few decades. Why stop there?

Will Google's stock ever top Warren Buffett's Berkshire Hathaway Inc. (NYSE: BRK.A) which now trades at the princely sum of $120,800? I am not sure if this will ever happen but the possibility is certainly intriguing. The company reports earnings October 18.

No doubt the faithful are waiting on pins and needles until then.