As it happens, I've already done a diary entry about this very question. In fact, I don't really have any new answers. It's pretty straightforward. I'd take the cash in a flash.
People are crazy to take the installment plan.
You can't possibly count on the money until you've got it in the bank. I'd hire a tax attorney and find myself a broker or three. I'd pay off my debts. No money for people charities like United Way. People will benefit from the conservancy charities, anyway.