Ligonier Ministries has a list and discussion of their top five commentaries on Deuteronomy. I would place Merrill and Weinfeld commentary in the top five replacing Thompson and Currid. I would also include Miller (Interpretation) and von Rad (OTL) to the runner-up list. In any case, the top five they have listed are:
1. Peter C. Craigie -- The Book of Deuteronomy (The New International Commentary on the Old Testament, 1976).
2. J.G. McConville -- Deuteronomy (Apollos Old Testament Commentary, 2002).
3. J.A. Thompson -- Deuteronomy (Tyndale Old Testament Commentaries, 1974).
4. John D. Currid -- Deuteronomy (EP Study Commentary, 2006).
5. Jeffrey H. Tigay -- Deuteronomy (JPS Torah Commentary, 1996).