I take a rational and sensible approach to much of my life, and those things beyond simple analysis (spirituality, etc.) still have a logical flavor in my reckoning.
In relationships, a reasonably high intelligence is something I look for. As well, someone who is mature in the "gracefully appropriate" sense of the word sooner than the "lifestyle adherent" sort.
I seek companionship above all else and don't over-emphasize the physical or passionate aspects of a bond.