I'm of the opinion that you should always use a limit order, but you don't always have to do it the way Greg originally suggested. If you have decided to make a purchase, make it with a limit order, NOT a market order. You can put the limit order price in a the current market price, or a few pennies above or below. But if you use a market order, you could get hit with a 'spike' in the price, paying more than you planned to.
I never use a market order.
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