Paul Himes gives some recommendations for Resources for Studying and Teaching the Epistle to the Hebrews. However, he misidentifies the author of the WBC series, who is William Lane (not William Lane Craig). He does not mention another good conservative commentary: the one by Gary Cockerill in the NICNT series. I am puzzled why he identifies Lane's, and even Attridge's, commentary as secular. I would add Craig Koester's contribution to the Anchor Bible Commentary and David deSilva's contribution to the Social-Scientific Commentary series as top commentaries.
Peter Leithart opines about Atonement according to Hebrews. He also comments on the enigmatic passage, "We Have an Altar," in Hebrews 13:10–12.