This is why I love Motley Fool, a website with amazing information (also, like me, they obviously place a premium over information than looks ;)):
“Generally speaking you should attempt to pay off the debts with the highest interest rate first. Some people, such as Dave Ramsey suggest you pay the card with the smallest balance first, that’s fine, and can help you feel you’re getting rid of the debt quicker, but it’s not the most efficient way. This calculator allows you to enter up to 20 different debts with their associated APRs, and the total amount you want to spend per month servicing your debts, and it’ll work out the order in which you should pay them together with the monthly payments.”
And then – THEN! They have this awesome calculator for you to use. Rock on.
Here’s the link: http://www.whatsthecost.com/snowball.aspx