I am currently teaching the gospel of Luke and consider Nolland to be one of the most consistently useful sources I have at my disposal. His explanation / application sections are always well considered and thought provoking. Out of a list of more than fifteen commentaries, I have found these to be exceptionally useful:
1. Nolland, John - Word Biblical Commentary
2. Bock, Darrell - Baker Exegetical Commentary on the NT
3. Garland, David - Zondervan Exegetical Commentary on the NT
4. Green, Joel B. - New International Commentary on the NT (new)
5. Edwards, James - Pillar NT Commentary
6. Bovon, Francois - Hermenia
7. Marshall, I Howard - New International Greek Testament Commentary