I purchased a preowned 2008 Classic 25fb about 18 months ago. I believe they ran from 2002 to 2009. The 27fb has larger kitchen drawers, more counter space, a microwave in a slide out from the pantry and a larger hall closet than even the two separate closets the 25 model has, plus the queen bed turned to the front of the trailer. Same rear dinette and gaucho sofa as the 25.
Here is a link to Airstreams document archive.
Document Archive - Airstream
Couple of small differences is the Classics don't have the storage door above the fridge and doesn't have the storage down under the dinette closest to the door. There is storage under the door dinette but you have to lift the fusion to and lift the panel up. The cushions have wide velcro sewn into the cushion and makes it hard to remove from the dinette panel easily.
The darn radio system takes up the street side overhead cabinet. Considering the size of the trailer there isn't much cabinet storage. Two over the kitchen, two over the dinette (one is taken by the AV system) and two over the bed.