Braconids are tough to ID even to subfamiliy. There are a few tricks for the most common groups. This picture is of the subfamiliy Aphidiinae. They have wing venation reduced to a point where you might think they are Ichneumonids (see the horse-head cell), but there are other characters that accurately place them within the Braconidae).

I can't recall any specific examples of other aphid parasitoids, but I'm pretty sure there are Chalidoids that go after aphids (what don't Chalcidoids do?).