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The CRA will allow you to set up a payment arrangement after you have tried to borrow money to pay the tax debt or rearrange your affairs.
According to the CRA Web site If you cannot pay your balance owing on or before April 30, 2013, we will accept a payment arrangement only after you have reasonably tried to get the necessary funds by borrowing or re-arranging your financial affairs. If the CRA agrees that you are unable to make a full payment, an agent can develop a plan with you to help you pay your taxes. Call us at 1-888-863-8657 to discuss a payment arrangement. Our agents are available Monday to Friday (except holidays) from 7:00 a.m. to 11:00 p.m., Eastern time.
If you can pay the entire amount for one of the tax years, I would do so
Then, if you can borrow funds to pay the tax do so
If not, then contact the CRA at the phone number listed above to make payment arrangements with them.