I dont know if you realize the full gravity of what a repo will do to your credit. It may be easier, and less of a hastle now, but it will screw you over BIG time later on.

If you cant afford the car, I would try and sell it, or refinance. You can work out a deal to sell the car even if its not yours yet. My uncle just bought a car that way used. He bought the car, and the money he paid the seller was used to pay off the bank note they owed, now she is free and clear.

Drop your insurance, and take the car off the road if you cant afford insurance and the payment. Your credit is that valuable. Sell the car for $17.5k, you'll be in the same boat without a car, but your credit will be intact. So in the future when you need to buy a car, house whatever, you'll actually get a loan, at a decent rate. If you think 10% was a bad rate, wait till you need a loan a few years from now after a repo.