1) Misaki. Seriously guys, who here wouldn't lik a chick that digs games, weilds dethrays, and doesn't mind getting dressed up in spandex so long as you pay her enough? (Did I just say too much?)
2) Excel, the original and close to the best. The difference between #1 and #2 on this list is very, very small. However, the early idiocy of Excel puts her behind the slightly more perceptive Misaki.
3) Shioji. Gotta love the science man, even if he loves little girls. At least he acknowledges that he can't have them, as opposed to kidnapping/raping them. Which, in my books, is a good thing.