Unfortunately, "can" afford doesn't always mean easily, or should.
i agree, but if he just stated "can afford," its not up to us whether or not he should/can easily. Thats his call.
Personally, even if i could afford it, which i cant, i would stick with the 2.5.
Im a cost cutter though, and would never see the reason "just" for the 2.6.
some people are insane with their money, and they simply want the best. The 2.6 is the best, whether or not it offers the bets bang/$ is up to the person buying it.
I love when people ask what they should do with their money

Its so much easier to spend theirs, than mine
I personally went with the 2.4 because quite frankly, the 2.4,2.5,2.6 all will do about the same, and the 256 vs 512, well thats a waste. I got the best bang/$ on a MBP, and so does every one else that just gets the 2.4
my 2 pennies.