As a foreigner (when you fill that W8BEN), you don't pay capital gain.
But, you still have to pay the dividends tax (approx 15%). But, you're withold approx. 28% which you can claim it before the usual tax year end for US (April 15th).

Remember:
Capital Gain = no tax for foreigner
Dividends = yes (15%).

Note the difference!

You have to file the US tax form 1040NR by April 15th (for the prior calendar year)

Remember, they withhold approx. 28%, but you still have to pay 15%.
Therefore you're only claiming back 13%.

A lot of people just don't care about filing the paperwork because if the dividends aren't that much.

For example;
If you're given $10 dividends (for the entire year), US govt withhold $2.80.
You filed claim, you're getting back $1.30c. $1.50c still have to go to Uncle Sam.
What can you do with $1.30c nowadays?   

But, it may be worth it if you're getting thousands of dollars in dividends... 

nobody knows.

why AAPL? Because it just shoot by 100 US$?
All depends on your risk appetite and total cash in hand.
Assume u got 10,000 $ in hand, u can get only 16 shares say at 600$
When Apple hit 615$, u earn 15x16 > $230 less charges etc.
Once economy starts booming, banking stocks are better bet.
Get Banking ETF ----> XLF or just plain banking stock like BAC

BAC 10$ x 1000 = 10,000$
Up by 20Cts, you make $0.20x1000 = 200$

BAC can even move back to $15, hence $5x1000 > $5000

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Added on March 20, 2012, 11:12 pm

a little poor on the options volume, means hard to trade.

damn normal. its not a correction if just down by ~50 points.
CORRECTION is a major 3 digits plunge, continuously or in the similar pattern.

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Added on March 21, 2012, 10:19 pm

Micron, ie MU. Low debt. Check the financial.
Good volume, big intra-day movement.