The Value of Suited Aces in NL Hold 'Em

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The most tempting hand for me to play in MP to LP is a suited Ace (for this discussion I'm talking about when my other card is 10 or lower). I know that Ace-rag is a horrible trap hand and that the probability of making the flush is somewhere in the neighborhood of 6% but it is such a tempting hand and can make such a monstrous pot. I typically limp with my suited Ace and fold to an appreciable raise.

How frequently and in what position should I play the suited Ace? Always limp pre-flop? Any general guidance for pre-flop strategy would be appreciated.