Technical series
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The New International Commentary on the New Testament, 18 Volumes
Simply put, these are the kings of the hill. In almost every case, the commentary on any book of the New Testament that is in this series is the best in its class (or just about). For decades these have been the best of the best. When I have serious work to do, it is usually to one of these that I turn.
The books are written by scholars, and include information for the scholar and non-scholar alike. They are in the process of being updated under the watchful eye of Dr. Gordon Fee, and my guess is that in every case the update will be an improvement to an already great commentary. Like any series of this depth, the volumes can be purchased individually.