See this post for Scot Mcknight's recommendations concerning commentaries on Luke. He lists
Joel Green, The Gospel of Luke (New International Commentary on the New Testament)
Darrell Bock, Luke (2 vols.) (Baker Exegetical Commentary on the New Testament)
John Nolland,Word Biblical Commentary Vol. 35a, Luke 1:1-9:20 .
Joseph Fitzmyer, The Gospel According to Luke I-IX: Introduction, Translation, and Notes (The Anchor Bible, Vol. 28).
These are solid recommendations.