It does matter what you will be using if for,... in some specific ways it is worth it (remember that cache is the most single expensive item you pay for on the processor anymore). Gaming and some other types of applications will benefit some (think high "chunks" of data with quick "changes" being made).
Gaming, Video/some high end Sound editing, Photo editing in very select instances.
Do you use it solely for a gaming machine???,... probably worth it for that extra bit so it is easier to accept a loss than blame it on equipment.
Commercial editing,... definitely worth it!!!
Casual use??? even gaming??? well $40-$60 can be used to:
1) keep in pocket (better than working 1-8hrs for more!!!)
2) pay for HSF/cooler ($30-$60) to overclock higher and achieve close to same as the other chip @ same price point (less potential of course as you can pay and do same to other chip)
3) add to what you would pay for a GPU and get the next level ($30-$100) (great especially for those doing a budget computer) to get better gaming level and same overall performance.
4) add/increase ram another 2 gb ($30-$50) to go from 2gb to 4gb