Oh this is way, way too hard!
I would either rescue another greyhound, and it would come with a name. I would probably go with a younger one again, because of the place we are in life. I might get another male, because our Buddy is so *perfect*!
Of course, I'd also really want to rescue that Irish Wolfhound I keep talking about, and name it something trite and predictable like Murphy or O'Malley or Killarney!