http://www.uesp.net/wiki/Skyrim:Followers#Permanent_Followers
http://www.uesp.net/wiki/Skyrim:Marriage#NPCs_available_to_be_married
Mjoll the Lioness, Uthgerd the Unbroken, Vorstag - these three would be best. If you join the companions, try Vilkas. Any housecarl will do - the advantage is that you get Lydia very early in the game.