For anyone with alot of debt, it would be wise to do the income-based repayment plan, and then take advantage of the public service loan forgiveness after ten years (or 120 payments).
A single person with no dependents making an AGI of $75000 with 200,000 of debt would pay about $750.00/month on the IBR plan. The payment goes down as dependents are added. The remaining balance is forgiven after 120 payments, and does not have to claimed as income.
On the standard repayment plan, same scenario, payment goes up to about $2300.00/month.