The Andersen/Freedman and the Paul commentaries are the two best commentaries on that list (and are among the best on Amos period). Paul is Jewish, of course, which might influence your decision, but it is an excellent commentary, nevertheless.

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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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