The Revelation of Jesus Christ (Chapter 1)
Alright. Here we go--the first chapter of Revelation. Highly charged imagery, dense Jewish symbolism, intense cultural and religious pressure, and a rich history of literature collide, producing (in my opinion) the greatest spiritual vision in the Christian experience. If you can enter into this vision, you will see Christ.

A Likely Candidate
MarciaGerald writes:
I have heard it taught that this messenger is the same messenger who went to Gideon, and to Mary the mother of Jesus, Gabriel the angel.
Grizzly Bear writes:
As I remember it, the Bible references only two angels by proper name. Michael (the Warrior), and Gabriel (the Messenger). In the (Catholic) Apocrypha; 2 Esdras 4:1 mentions an angel named Uriel. Tobit 5:4 mentions one named Raphael. I'm not Catholic so I'm not well versed in the Apocrypha. There could be more I haven't found.
If you are working from the Old and New Testament Only perspective, I think Gabriel would be the more likely choice. But I don't think that necessarily eliminates the possibility that God has more angels than we know about.