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The orbital axis of all the planets in our solar system are roughly parallel (within 10 degrees, Mars is just under 2 degrees off ours), so it would be fair to pick a north pole at the same "end" as ours. http://en.wikipedia.org/wiki/Orbital_inclination

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Fun fact: Uranus is at 97+ degrees, making it almost perpendicular to the other planets axis

http://en.wikipedia.org/wiki/Uranus#Axial_tilt

Hm, guess that means I don't understand the article I linked to.

I think you were confusing orbital inclination with axial tilt. http://en.wikipedia.org/wiki/Axial_tilt

The article you linked to describes the angle of plane of the orbit - the circle it makes around the sun. These vary by only a small amount.

The axial tilt is different. It is basically how far the axis through the poles of a planet is tilted compared to the plane of its orbit. This is what you were thinking of initially - it can very a lot.

Pluto, while no longer a planet, as an inclined orbital tilt as well. It will also occasionally come inside the orbit of Neptune.

http://en.wikipedia.org/wiki/Pluto#Orbit_and_rotation

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