For research papers, the most important commentary of all is undoubtedly
Williamson, not least because of his outstanding bibliography (he has several important articles listed on chapter 9. I would also check out the New Testament abstracts series at the seminary).
Fensham,
Blenkinsopp,
Kidner,
Davies, and
McConville are also important. Among more recent commentaries, check out
Levering and
Throntveit.