Hi Tracy,
A quick check with the spreadsheets reveals two things
1) If you take the 0% interest deal, you will owe $4200 in 04/14
What will the interest rate be then? Are there likely to be other offers like this at that time?
2) If you take 1.9% interest, you will owe $4302 at 04/14 and only $1314 at 09/14
Whatever interest rate you find by then, you should find that last bit easy to pay off with your $600/mo
Remember, inflation should bring you a bit of a rise in income by then, which you will dedicate to debt repayment (of course!)
So the only real question is: how likely is it that you'll be able to find a low interest credit card/line of credit at 04/14?
That's not the sort of thing I know about, but you obviously look into it quite often, so you can see the numbers. You'd be sacrificing about $100 of interest over the course of this pay-down in order to keep your finances a bit more predictable.
That call is definitely yours to make. I can only provide the numbers.
Best of luck. It's nice to read positive stories like yours.