Here are a few off the beaten track as it were:

Tom Bowling
MacCrimmon's Lament
Bonnie Lighter Boy (Aka My Darling Ploughman Boy)
Megan's Fair Daughter
Laird o' Cockpen (except I like the older versions where she DOESN'T accept the pompous ass)

And, of course I have to include Bonnie Lesley by Burns - May not be a great tune but I have a special fondness for it....