SD card for Clip Zip?

Obviously, 18 was a typo, and as I said, my info came from the manufacturer.

I ordered the 16G Level 4 which is more than enough space for the audiobooks I’ll be downloading. Between my 4G and 8G Fuzes, 2 iPod Nanos, plus a 1G Shuffe for exercise music I’m not likely to run out of space. 

My problem is that the iPods are really lousy for audiobooks - you can’t tell where you are and if you lose your place it can take forever to find it again.  It’s worse on the 6th gen than the 4th and both are difficult to cue with overly sensitive controls.