The first plan selection.

[micheus]

You can use "Select > Similar normals"

yeah but when mesh is more complicated, not squared like in example above ?

I think Radi is right. Give Similar Normals with options a try (that small square in the right side of the menu option). You will see that you can adjust the normal angle tolerance.

Also, there is another problem in my example above.
look at the first image and where its selection box, normally faces within box are selected, but when SHIFT is pressed - no more.

That is not a problem, it's a feature. Did you noticed the Information Line?
"[Shift] (De)select only elements wholly inside marquee".
Just increase the selection area.