I've seen and heard many incarnations of this song. Michael Buble actually does a cover of it on his new album. I don't think Buble's version does the original much justice because his vocals just doesn't fit with how this song should be sung. It just doesn't have that soulful bottom to it.
As far as love songs go, "At This Moment" is one of my all time favorites. The live performance is really what I enjoy hearing the most because Billy Vera's vocals express the sentiment of the song so perfectly. Again, I've seen him perform this song many times and he always delivers.