Thanks for the response Phill.
"Actually dips are a verticle press"
I guess it depends on how you perform it but if you lean forward whilst dipping to hit the chest more I'd consider dipping to be a horizontal push.
When I was using the ABBH 1 program I chose military press as my vertical press exercise simply because it was the only big lift I could find that I was certain was in the vertical plane. Alot of others, inclines and dips for example, seem to fall into either category depending on your perspective.