Regulus | Narcissa
As hard as it was for me, and I don't dislike her. She does exceptional work for the museum, is smart and talented, and her family isn't completely unfortunate. She has proper interest in and respect for the old families, and if she and Sirius should procreate, their children will be Purebloods.
And yet, Sirius has managed to turn what could be an almost acceptable match into a mockery and a farce. Of course, he's in good company these days, as my husband has shown about as much sense as your brother.