The Book of Job

I am preparing a sermon series on the Book of Job and Habel's work has been very helpful. While not as good as Hartley's work The Book of Job (New International Commentary on the Old Testament)or as extensive as Clines' Word Biblical Commentary Vol. 17, Job 1-20 (clines), 617pp I find it better than Andersen's Job (Tyndale Old Testament Commentary Series). If one can only afford one modern commentary I would reccomend Hartley and Habel would be a close second.