benefited immensely from Jerry Sumney's Philippians: A Greek Student's Intermediate Reader . This volume is power packed with exegetical insights, serving simultaneously as a reference grammar and as a commentary with the kind of detailed notes found in most mid to upper level commentaries.
One series that specializes in this genre is the Baylor Handbook on the Greek New Testament series. Although I confess to not owning either of the two volumes released thus far, that is soon to change with a volume on Ephesians due out this fall.
William J. Larkin, Professor of New Testament and Greek, Columbia International University, Seminary and School of Missions, brings his exegetical prowess to Ephesians--one of my favorites in the Pauline corpus and the NT for that matter.
Here is the blurb:
In this volume, William Larkin provides students with a reliable guide through the intricacies of the Greek text of Ephesians, introducing them to consensus views on matters of syntax, semantics, and textual criticism. In addition, the annotations contain references to current debates relating to the language of Ephesians. Larkins annotations demonstrate that linguistically informed analyses which have appeared in the last couple of decades frequently shed light on old questions.
With commentaries by Max Turner (NIGTC) and Frank Thielman (BECNT) on the horizon, the publication of this volume should provide an exegetical feast on this rich letter. I know Mike Aubrey's going to add to his Ephesian collection!