Yea I'm really thinking about it...even the jump from 1.6 to 2.13 GHz is in fact a hefty jump in processor speed.
I do love my rev b as it's a secondary computer but the price and free ipod is almost too much to resist. With edu discount and ipod I'm looking at $1500 for the high end. I paid an embarrassing $2100 for my base Rev. B (Japanese prices...grr).
Unfortunately though, to the best of my knowledge the Rev C still ships exclusively with the bad 9C90 (mine has this screen as it is).
Also I'm really wondering if I should hold out for a massive upgrade/redesign (256 SSD/4GB) due around January or thereabouts...but the pricing wouldn't be pretty at all like it is now...though if I upgraded again then, at least I would've maximized resale value on the Rev C with all the sweet offers/pricing going on now.
Also I should note running Windows Vista Ultimate (yeah yeah I know, I don't have XP and don't like running outdates operating systems) when needed even through bootcamp basically, well, um...sucks. Runs like a dog and the fans instantly go to full blast just idling. Though I think that's more of a RAM issue than processor related.