You probably would own zero capital gains tax if you realized gains in 2011 or 2012. Others with higher earned incomes would own 10% to 15% in most cases. Study this article:
I CAN'T ADVISE YOU HOW LONG TO HOLD YOUR SHARES. BUT IT LOOKS LIKE CAPITAL GAINS ARE NOT MUCH OF A FACTOR UNLESS YOUR EARNED INCOME BECOMES HIGHER THIS YEAR OR NEXT.
SO YOU ARE FREE TO TRADE AS YOU SEE FIT FROM A TAX PERSPECTIVE IF I UNDERSTAND YOUR SITUATION.