> What books in your esteemed opinions are the best for the study of Galatians?
There are a bunch.
Bruce - NIGTC. He ably defends the South Galatian theory and early authorship.
Burton - ICC
Betz - Hermeneia
Fung - NICNT
These four above are more meaty.
Cole - Tyndale. Shorter, but helpful.
Guthrie - NCB. Good intro.
MacArthur - MacArthur NTC. Makes sure you don't miss the forest because of
Boice - Expositor's NTC. Very practical. Same comment as applies to MacArthur.
Lightfoot - a classic.
I am just finishing teaching a small group on Galatians and used several
of the above.