I started out with much less and reinvest roughly half twice weekly. This way I can make my contract last longer and start collecting payouts whenever I decide it's most profitable.
I am slightly disappointed that the cost per GH/s is now up to $2.20USD plus regular maintenance fees though.
I think I'm going to withdraw once I reach my breakeven point, and then I will keep reinvesting my gains.
Even though the price went up, It is still profitable especially if the price of bitcoin goes up.
I would wait to withdraw until you reach a bit more than break even to cover transaction expense.