Anubis. Because he is the Keeper of the Gate between this world and the Realm of the Dead, as well as the judge of souls. He can be your best friend or your worst enemy, depending on his mood, or depending upon your actions...much like my own personality. To quote a line by the Anubis character from Stephen King's "Kingdom Hospital"-- "I do you a solid, you do me a solid. That's the way it works."
I chose Anubis as my patron God because, well, he's a dark God, a god of Death, and I like the darkness, nighttime, the shadows, death, necromancy, and anything else morbid and macabre. I have a statue of Anubis on my altar, as well as one of Bastet, the Cat Goddess.