Calvin and Henry are both great. If you already have these, then you could get Kistemaker and Hendriksen for the New Testament. Keil/Delitzsch is great, but you need Hebrew to get the really good stuff out of it. Past these, I would concentrate more on single volumes than sets, which are often uneven.

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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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