Well this topic whas allready disscused! If you want to have the fastest processor, then take it, its like to say, i have the fastest processor at the momment! But as is know in the apple spec, the cache speed is from 2.66ghz away, so there will be no real differece you may see for 0.3 Ghz of speed differece. It only means that the processor runs faster than the cache, only this, but in real ultilization, there will be no difference at all. You may conside to have the 8GB of Ram or the 250GB SSD Harddrive, this makes alot difference. But you may first wait till they came to be cheeper in price. Or you may consider the matte screen over the glare screen, this makes difference. And you may consider the 17 over the 15 inch, cause of the better processor type and better mainboard, for with those you can use 8gb of ram latter. This is what i can say for now...
I have ordered: 2.93GHZ cause i want the fastest process for macbooks at momment...with 4gb ram and 320 7200rpm harddirve, with a matte screen, this is enough for me at the momment...greetz