I also used
the font embed option to add Charis SIL and it renders much nicer that way than using the same font from the list.
Not exact matches
If you have the
option ePub is probably the best format for this device as it will keep the
fonts if
embedded, has wide range of zoom and generally will be closest to a print book (albeit a mass market paperback).
It has a few interesting
options like converting the headings, which often use fancy
fonts, to pictures that can be legally
embedded in the ebook (
embedding fonts is often not allowed, even if you buy a license of the
font, but using pictures is allowed.)
With Kindle DX you can use one of the many
options available for converting your book to PDF with
embedded fonts and read it on your Kindle DX.
When reading PDF files none of these
options are available since
fonts are
embedded into the files themselves.
pdf in Microsoft Word, go to
Options > Save and check the item that reads «
Embed fonts in the file» or similar.