I realise that this thread is old, however, it has been quite a long time since I have read much of what is going on with this forum, a few years now.
On Gospels, for Matthew, I like the old Cambridge commentary (on the Greek text) for schools, by Carr. These are small commentaries, but pithy. There was a new series of them started, but the two I know of were on Colossians, by Moule, I think, and Mark was covered by Cranfield, in the new series.
Mark had a good 'older' commentary in Vincent Taylor. I haven't used it.
On Luke, I like Fitzmyer, although it doesn't really print the Greek text of Luke right in the commentary. So, Plummer in the ICC series, and Bock, in the Baker exegetical series, for Luke.
For older commentaries on John, I have enjoyed the comments that Bishop B. F. Westcott has made on the Greek text.
I have been spending more time in the Gospels, and not so much in the epistles, and so I will be quiet. I read a review of Cranfield on Romans when it came out, and that attracted me, so I bought it. I admire the work that he did on that. However, when I turned to his discussion of Romans 8, I wanted to see what he would have to say about the spirit of adoption. The remarks, I thought showed forth his Methodist, more Arminian theology. I think Cranfield was a Methodist. I was looking forward to something else than what he had to say about it.