Colossians and Philemon. TNTC. InterVarsity Press, 1989.
I recently preached a series on Colossians and found N.T. Wright's commentary by far the most helpful when it came to a meaningful exposition of the text. I felt that, while other commentaries often jumped to conclusions with the passages I was studying, Wright offered a simple exposition that was rooted in the history of the text. This really helped me understand the main thrust of what Paul meant when he wrote these letters 2,000 years ago. I'm by no means proficient in Greek, so appreciated how Wright explained the various definitions of Greek words. If you want a solid commentary on Colossians, then I would thoroughly recommend this book.