Harry Sawyer would be your first choice, Gayle. I confess to being a bit in love with Harry myself. JN and Steve Zahn, JN and Ally Walker, JN and William H. Macy, he had marvelous chemistry with each of them.
And devilish Jack Devlin! Jeremy knows how to do evil, doesn't he? I love the way he gave the character some dimension by letting you see that he's genuinely attracted to Angela and a bit conflicted about what he has to do. Not that it stops him for long...