And the huge cost of the additional storage is something you can almost count on not getting back because the price of SSD storage should drop dramatically in the next year.
Agreed this is one of the reasons why i opted for the 256, however for some the onboard strorage is justifiable. In general I have always bought high end and upgraded 4 years or so, now with the Retina and Intel`s advancements this no longer holds true as base and high end performance has never been closer and SSD`s will drop in price across the board as they gain traction in the mainstream.
For those that can moniterize the difference, for those that just want the largest numbers the high end BTO`s make sense...