I'm currently reading about 45 commentaries on Romans in preparation for my sermons on Romans. I have not found Haldane as helpful as others seem to have, although he certainly makes good points here and there. For expository commentaries, I prefer Lloyd-Jones and Boice. One commentary I think is essential is an out of print commentary by Anders Nygren. This is an absolute jewel, especially for his sense of the flow of Romans. In fact, it is the best book I know of for getting the big picture. Sproul is okay, but it could have had greater depth. And it's missing a sermon. There's no sermon on 3:27-31. I was especially disappointed in this, because of all the hay that N.T. Wright attempts to make out of the passage. For exegetical commentaries, despite his sometimes Barthian tendencies, I find Cranfield the most helpful of the moderns. Hodge and Meyer are excellent older exegetical commentaries. Schreiner's commentary needs updating, as some of his positions have changed (he now holds to imputation, for instance). Moo I do not find as helpful as some do.
