Clip+ or Clip Zip

I’ve come across the following 2 Clips for sale online – The cost is about the same for each:

– Sansa Clip Plus Clip+ 8GB
– Sansa Clip Zip 4GB

They are both new, and I’m trying to figure out which one to buy.   Thoughts?

I’m embarassed to admit how much I’ve spent on these discontinued gems over the years.

I listen mostly to audiobooks – from Overdrive when possible, and from Audible when I can’t find what I want on Overdrive.  I would normally go for th e8GB over the 4GB, but for audiobooks, the size isn’t a huge factor.  I rarely reach the size limit before I’m ready to delete old books and add new ones.