Yeah, I'm pretty sure for the sake of comparing greats, those matchups you listed, except possibly the 3rd one, are what people have in mind.
For sure any matchup involving peak Laver/Sampras/Federer on grass particularly would be the most interesting.
A Borg/Lendl/Nadal matchup would also be quite intriguing however if it was Muster/Kuerten vs Nadal, that would also be just as good to watch.
Other matchups I would of loved to see are:
Connors vs Hewitt
Sampras vs Nadal (hard/grass)
McEnroe vs Federer
McEnroe vs Nadal
McEnroe vs Sampras (I know they have played, but McEnroe was clearly not the player he was pre-1985)
McEnroe vs Laver
Federer vs Wilander (now let's see who has the balls
I have a bunch more in mind, but it would be unending