Rune from the thieves guild cause he's HOT.
I like Teldryn Sero too. He was one of the best followers I've ever hired in the game. I used the creation kit to remove his helm and put him in scaled armor... NICE ;)
Honorable mention would be Vekel the Man and Glover Mallory cause they're quite pleasing to the eye. It's all about the looks... ya know?