Best Single Volume Commentary on the Old Testament?

Compare the IVP OT Backgrounds with this excerpt from Unger's Commentary on the OT:

Unger:

(1) Job declared that he knew he had a Redeemer, a goel.

This goel was the next of kin, whose dutiy it was to redeem, ransom, or avenge the one who had fallen into debt or bondage, or who had been slain in a family vendetta (Lev. 25:48; Deut. 19:6-12).…Job was convinced that God in the varied conditional functions of the Goel, would take it upon Himself to avenge his quarrel, be surety for him, act as an umpire, and vindicate him—in short, do what his professed friends would not do, even if they could. 

(2) Job declared that he knew that his Goel-Redeemer was alive, presently as a reality, existing at that time, and not someone to come into existence later, though His manifestation in humanflesh was to be an event in the future.

(3) Job declared that at the last his Redeemer would take His stand on the earth…particulary in a juridicial sense as a Witness in a trial (cf. 16:8; 31:14; Deut. 19:16) to vindicate Job in the sense of a Goel… “God himself will avenge Job’s blood, i.e. against his accusers, who say that it si the blood of one guilty” (Delitzsch, Job, 1:354). This of course, could only be accomplished ultimately through the incarnation of Christ, as the New Testament shows.

(4) Job definitely referred to life beyond death in a resurrection body. 

A great change will occur at death involving compensation for the inequalities of life.…[And after my skin has been…destroyed, then from my flesh I shall see God]…Here latent in the Old Testament is the doctrine of the resurrection of the body (cf. Gen. 22:5; Psalms 16:10; 49:15; Isa. 26:19; Dan. 12:2; Hos. 13:14).…My eyes shall behold intimate the use of a body after death! 

(5) Job’s faith struck the joyful note of hope that the truth of the resurrection of the body always inspires (cf. 1 Thess. 4:13; 1 John 3:2-3).…His heart (“reins, kidneys,” considered the seat of the emotions) was consumed within him as he waited in hope.  (1:705-6)

Here is another excerpt from Unger's comments on Isaiah 53:4

Converted Israel will confess that the Messiah vicariously bore their griefs and sorrows.

The quotation and meaning of 53:4a in Matthew 8:16-17 show that this verse was fulfilled not on the cross but before the cross, although inseparably connected with the cross.  Verse 4 and its fulfillment in Matthew 8:16-17 show that physical healing is not in the atonement, but rather that spiritual healing guarantees a future glorified body.  Physical healing is a sovereign act of God, flowing from the cross of Christ, but it is not an integral part of the atonement.  Christ died for our sins, not for our diseases, for physical disease in itself is not sin; it is merely one of the results of sin.

4b. Israel will confess that the Messiah bore shame and misrepresentation.  The latter half of this verse dramatically describes Israel's self-accusing confession at the second advent concerning the true cause of the Messiah's sufferings: "We thought they were His own sins He was punished for.  But, alas, they were ours!"

In the Talmud, Jesus of Nazareth is relegated to hell alongside Titus and Balaam, undergoing the severest and most degrading punishment.  What a wail of repentance will arise at Christ's revelation when Israel realizes her terrible mistake and sin in maligning and crucifying her Deliverer!

     I have probably received more positive feedback from students on this OT book than from any other resource.  Years ago when I taught Isaiah I had a number of students who loved the excerpts that I had typed up (and made study questions from).  The students really wanted to buy the book but it was out of print and hard to come by.