Not that bad of a deal..
Just estimated my Late 2006 MBP 2.33 15" for $635.
Makes me feel better about adding a 2011 MBA to complement the 2010 MBA i already have.
My problem is - i wished Best Buy carried the i7 256s.. .
I can understand that. I more than likely would have gone with an i7 11" had I had that option through best buy. I guess the only thing I can say is that there isn't a huge performance increase from the 1.7 i5 to the 1.8 i7. Anandtech had it at ~8%.