It depends on how much you owe each one, and how desperate they are to have you pay them.

I would probably take the smallest amount owed, pay it off first, and then roll that payment over to the next smallest, and repeat. That way you get rid of them one at a time.

Alternately you could weight the payments to reflect how much you owe (in other words, the guy you owe the least to gets the smallest payment, and the guy you owe the most to get the biggest). That's probably the fairest way.

You should stick to your agreement and pay the amount you said you would.