In the last year I replaced my copy of Meditations, which I didn't like very much, and surveyed most of the existing translations in the process, comparing them to each other and to the original Greek.

Maxwell Staniforth's was my favorite, being both faithful to the original and easy to read. Hammond plays too loosely with the material, IMO.

The only hardcover I know of:

http://www.foliosociety.com/book/MDS/meditations

A paperback:

http://www.amazon.com/Meditations-Penguin-Great-Marcus-Aurel...

This was the best translation I've found.

http://www.amazon.com/Meditations-Penguin-Great-Marcus-Aurel...