somegeek, the overall structure of the tree is what really dictates where a branch should go...hard to tell without seeing the whole tree.
In general...most bonsai techniques replicate some natural event that impact a tree's shape. Old branches (lower branches are usually older) are pulled down by gravity, snow, age. Usually, the lower the branch, the more it assumes a downward angle, so avoid parallel lines like the green lines shown.
When you wire, put movement in the branch so that it isn't straight from any one view. You can also (carefully) wire it and twist the branch 180 degrees so it's upside down to get movement. You have to wire it a little loosely, and twist it in the same direction you wired it. Kathy Shaner likes the technique because it "sets" the branch well and provides you with some interesting wood if you decide to carve it later.