I look for:
1) facial features
2) height
3) figure (in terms of skinniness or broadness)
4) hair
5) voice
6) personality; personality doesn't really matter as long as they don't have any over the edge obsessions or weird interests (/special interestes)
7) intelligence; I really do not like having to explain my points because the person I'm talking to has a sixth grade vocabulary.
8) humility/arrogance; I hate girls who always think they need to be perfect and put on a show for everyone else or try to and fail
On topic and off of common formatting:
Breasts;
I tend to go for 100% real white meat (no artificiallity).
size: eh, they're great if they're good proportion, if not, there's nothing that can be done, well besides force the person to drink milk for the next three years.