I really think classic is in the eye of the beholder. One might think there's nothing more classic than a great red bag. I got a New Sand Bella bag and my sister said its one of the most elegant and classic colors she's ever seen. I would focus more on what color works for you and a color that you nine you'd wear for many years.
If you're asking purely in terms of BVs collection, a general rule of thumb is that if it's bright, pale or jewel toned, it's probably a seasonal color. The dark more neutral tones tend to be BVs permanent colors.