Harman in the Evangelical Press Study Bible Commentary series looks great, as does Sinclair Ferguson in the Mastering the Old Testament series. Longman is actually worth purchasing on Daniel as well. These are in addition to the many fine suggestions made already.

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Rev. Lane Keister
Teaching Elder, PCA, North Dakota (working out of bounds in a CRC and an RCA church)
http://greenbaggins.wordpress.com
http://brahmsgreenglove.blogspot.com
http://accenttranslation.blogspot.com
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