Your fascination with AAPL is blinding, isn't it?
The frustrating thing is that the $600/share estimate is not new, but they keep moving back the "expected by" date. To get to $610, AAPL would increase about 60% from its current price of around $385, but would have to increase around 50% from its high. It has a lot of new territory to go through to get to $600. I think there are other stocks that can do just as well, some of which will also kick in a nice dividend that AAPL does not. Stocks that have been unfairly punished over the last couple months.
I will continue to hold my AAPL stock, but doubt that I will be adding to it. I think there are "better buys" out there. Stocks that could return nearly 50% just by recovering to their recent highs of this year, from which they had been expected to gain 10%-20% just a couple months ago. There were no reasons for some of these stocks to have declined as much as they have, other than just the general market sell off.