Hi Dave,

Just like you I have Sansa MP3 Players (Clip Sport &amp; Clip Zip). These are awesome, something like 48 g, play several hours and if you treat them well last several years. Mine is now 6 years old. 
OGG is not their strenght, but can play most files. For this reason I always subscribe to MP3. 
I also like at least basic ID3-tags. The 'Album' is an important tag and only ID3v2 works well on Sansa's firmware. 

Unfortunately, the Zip at someday got stuck at "refreshing your media". I read you could open it and flash Rockbox or try to access via serial, but the housing is very thight, almost zero gap.

I plan to listen to your Rockbox flash podcast :)

Cheers
Reto