You should have been able to marry the main Civil War Jarls, like Elsif and Ulfric. I know Elsif was scrapped, but they should have put it in. Most of the other Jarls are married or have kids, so it wouldn't really work out (with the exception of Skald, but he's a jackass) and Igmund (but he's a jackass too). Oh yeah, and Siddegir but he's also a jackass.