You might consider the Ectaco jetBook. It has two views of the data. One is an internal memory+SD card view with readable files and folders only. This is for general reading use. The second is a file manager that gives a good view of either the internal memory or the SD card. This shows all of the files on the card and lets you manage them. The look and feel is very similar to my WM PDA that I also use for reading.
Regards,
Jack Tingle
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