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Should I finance a new home theater at 0% even though I have the cash for it?
Pay cash.  You have the cash to pay for it now, but God forbid something happen to you or your wife that requires you to dip into that cash in the future. In such an event, you could end up paying a lot more for your home theater than you planned. The best way to keep your consumer credit card debt at zero (and protect your already-excellent credit) is to not add to the number of credit cards you already have.   At least in the U.S., interest rates on saving accounts of any sort are so low, I don't think it's worthwhile to include as a deciding factor in whether not you "borrow" at 0% instead of buying in cash.