Is it worth paying points to buy down my mortgage rate?

My lender offered me two options: 7.25% with no points, or 6.875% by paying 1.5 points upfront. On a $420,000 loan that would be $6,300 upfront to save about $95/month. I plan to stay in this house for at least 10 years. Is the buydown worth it? How do I calculate the break-even point?