The "CAAD8" that Cannondale sells now has almost nothing in common with that older CAAD8, save for the name. 531Aussie's CAAD8 is almost indistinguishable from the CAAD9 if it wasn't labelled.

The current "CAAD8" is just a run-of-the-mill entry-level Al frame. I was actually kind of offended when Cannondale decided to even call it that, since it's certainly not "Advanced" (the second A in CAAD), and the older CAAD8 was actually a pro-tour frame.