Denver Seminary has put together a helpful bibliography on the major New Testament commentaries. Their suggestions for commentaries on Luke are listed below. (My comments are in blue)
Those marked with an * are particularly recommended by Denver Seminary
*Bock, D. L. Luke (BECNT), 2 vols. G.R.: Baker, 1994-96. (The breadth of Bock's two set commentary is impressive. This is probably becoming the "standard" evangelical commentary on Luke. If you can only own one Luke commentary then this two volume set is probably for you.)
Bovon, F. Luke, vol. 1 (Hermeneia). Minneapolis: Fortress, 2002.
Marshall, I. H. The Gospel of Luke (NIGTC). G.R.: Eerdmans, 1978. (Marshall has been and still is one of the premier Armenian commentators. This series deal extensively with the Greek text)
Nolland, J. Luke (WBC), 3 vols. Dallas: Word, 1990-93.
Fitzmyer, J. A. The Gospel According to Luke (AB), 2 vols. Garden City: Doubleday, 1981-85. (This commentary is done from a Catholic perspective. I have not consulted Fitzmyer's commentary on Luke, but if it anything like his Romans commentary then I would recommend purchasing it)
*Green, J. B. The Gospel of Luke (NICNT, rev.). G.R.: Eerdmans, 1997.
Johnson, L. T. The Gospel of Luke (SP). Collegeville: Liturgical, 1992.
Stein, R. H. Luke (NAC). Nashville: Broadman, 1992. (Stein is a well known conservative evangelical scholar who has produced some extremely helpful works for years on end)
*Bock, D. L. Luke (NIVAC). G. R.: Zondervan, 1996.
Bock, D. L. Luke (NTC). Downers Grove, IL: InterVarsity, 1994.