Ok...for a little levity...
When I was younger, I can remember thinking about the names I might have for my future wife. I don't know that I've settled on one, and it may well be that you just don't know the answser to this question until you've met your future significant other. But there are several which I can rule out and below you will find my reasonsing.
Babe-Growing up watching Saved by the Bell this was the term that was used to somewhat deroggatorily address Kelly and Jessie by Zach and Slater. I know many people who use this in an undemeaning way, but it strikes me as such. Not to mention, it carries with it the baggage of being the name of a talking pig...a talking pig from a movie I simply don't find funny or charming. Nothing says "I love you" like pig.
Darling-This used to be the favorite. It had a 1930's, Golden-Age of Hollywood, sound to it. But thanks to the folk song about a miner's daughter named Clementine, I can only think of Oranges when I hear "darling".
Sugar-obviously, this is out. Aside from the fact that this will subliminally cause me to gain weight, it is clearly derived from "sweetie" and as such, must be inferior to it. My wife shall not go by an inferior name.
My Beloved-It has a nice biblical and liturgical ring-check. But all good terms of endearment have two syllables are fewer. This simply doesn't fit within those parameters.
Anyhow, I'm open to thoughts on the matter.