Hebrews: An Anchor for the Soul (2 volumes in 1). PtW. Crossway, 2015.
Though a decent work, it is very devotional in nature and I did not find it aided preaching a very theological book at all.
The Epistle to the Hebrews. BMH Books, 1987.
My favorite commentary on Hebrews. Quick and to the point, he defends his positions well.