This translation by Muhammad Asad from the early 20th century is available online
and includes a detailed commentary. A 2004 edition is available in hard cover:
The Message of The Qur'an
Author: Muhammad Asad (translator)
Publisher: The Book Foundation (2004)
The translation suffers from the same problem that many older translations have, namely the use of old English. It also has its share of interpretations and opinions. However, it is an excellent reference based on thorough research, both linguistic and religious. In particular, the effort given to finding the original meaning of the Arabic words at the time of the revelation of the Quran provides a valuable reference for this project.