Not a bad idea, but would you want it to take into account some CPU's being an overclocker's dream or would you want it to be based on stock performance.
This list could also be very difficult too. Look at the i7, if you compare the two in a certain benchmark, namely gaming, you might not see much of a gap at all ... but if you benchmark with server applications you'll see a tremendous gap.
Secondly, you have the difference between quad cores and dual cores which is still hazy when it comes to benchmarks. Most apps don't utilize four cores, so where would you draw the line when you say such and such dual core processor is better than such and such quad core?
I'm not entirely sure a list like this would be doable.