If what your asking is:

3GHz 4 core CPU
2GHz 6 core CPU
1.5GHz 8 core CPU
etc..
0.1875GHz 64 core CPU

Then I will take a 3GHz 4 core CPU because too many applications out there only use 1 core anyway.

For the new Core I7's, outside of games what will use all the cores? Wee have hit a wall when it comes to making faster CPU's, so until someone finds a new method. Wee will have to make due with optimization. The problem is the software companies are slow or unwilling to use this new hardware.

Car analogies always seem to help, so.. A car with a 64 cylinder engine has a lot of power and could pull a house and a car with a 4 cylinder engine can go from 0-60 in 4.5 seconds. I like speed over power. :)