Penryn MBP 2.5ghz, or 2.6ghz?

Hey All,
I am looking to buy a new MBP, today even.
The salesman at The Apple Store told me the difference between the two is negligible. (So much for up-selling training...)
If the 4% increase in CPU speed translates to time, a 4:00 hour render would become 3:50.
It might not translate that way though.
Can anyone think of any other reasons to spend the extra $250.00 for this .1ghz upgrade? Resale value, would probably be negligible...
Has anyone found any benchmark testing of these two side by side?
I appreciate any any help, anyone can offer. (I think...)
Regards,
Richard

Thanks for the reply. I probably average around 15 hours worth of renders a week, some weeks could have as many as 25hrs. Rarely more, but I am only working in SD.
So, even with 20 hrs worth of renders, 4% improvement, (if it directly translates), is not even an hours savings. Which can often be done overnight.
+"today even"+
It does suck about the custom order, but as I do mostly video, I am also sold on the 7200rpm drive.
And again, I am still only working in SD. I imagine my rendering time would quadruple once I switch to HD. Am I wrong?
HD footage, I would guess, would need the extra 2400rpm, which is custom order as well.
So, no matter what, I wont have one for a week at least. But, the longer it takes to make the special order, the longer it will be before I have it.

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