You probably wont even find that CPU now new. Only a few Core 2 CPUs are still being manufactured and I would say by the end of the year they will stop makeing them all together.
Now also upgrading a laptops CPU dosent work about 75% of the times. Laptops weren't designed to be upgraded really besides adding more ram and switching out a hard drive you are pretty much stuck with what you got.
Best answer selected by astro56.
ya rule of thumb, don't plan any electronics purchases that far in advance