The e200 series is discontinued, but that’s from a production standpoint. The Sansa Fuze has taken its place in the current model lineup. There’s nothing wrong with the e200 as it is, in fact, it’s a solid machine.
For the version 1 devices, firmware versions “18” and “24” are the stable releases of choice. Some have had issues with the “24” release, opting instead to stay with 18. Both firmware versions are available here.
Next door, in the Sansa Rhapsody forum, the latest firmware for the R series is available.
For the version 2 devices (“03” as the first two digits of the firmware) with the AMS processor, the 03.01.16 version binary is the choice.