my choices would be Cameron Mitchell ( who i think appeared in 2) and John Saxon (who as far as i know appeared in 1). both actors made a lot of Italian films especially mitchell but did not do many in our genre.any others?
Anthony Ghidra.
He was great in all of his 5 Spagies.
Mike Marshall could have made a few ones more.
He played an interesting main character in ‘I sell my skin dearly’
I’d say Ghidra too
also
Henry Silva
Enrico Maria Salerno
women:
Giovanna Ralli
Soledad Miranda
Tina Aumont.
I also would have preferred Sean Todd alias Ivan Rassimov in a few more leads. Especially as none of his SWs is that great.
Gordon Mitchell and Fernando Sancho 
Maurizio Merli for sure.
Others:
Cameron Mitchell.
Anthony Ghidra.
Henry Silva.
JOHN PHILLIP LAW!!!
Ghidra, Merli, Law and Marshall are spot on. Of course I wish Clint Eastwood had made a few more Man With No Name films also.
From the top of my head
Enrico Maria Salerno
Maurizio Merli
Andrea Girodana
Jean-Louis Trintignant
Rod Steiger
Ladies:
Edwige Fenech
Carole André
Claudia Gravy
I’ve got to agree there. It would have been brilliant if Clint Eastwood had made some more Spaghetti Westerns.
Telly Savalas.
[quote=“LankyFellow, post:3, topic:1783”]Mike Marshall could have made a few ones more.
He played an interesting main character in ‘I sell my skin dearly’[/quote]
I completely agree.
AND:
Andrea Giordana!
John Philip Law
Robin Clarke
John Philip Law
Luke Askew
uh…what’is name again? Uh John…Philip Law? Yeah that one.
I think Robin Clarke is OK, but not so good, that I needed more flicks with him…
Maurizio Merli.
Anthony Steffen.
Just Kidding.
Orson Welles
Toshiro Mifune
Adam West
Johnny Halliday