Great list, not necessarily in that order for me...
#1 would be Clint Eastwood, if he stared at me like he stared at a bad guy, I'd go ahead and shoot myself.
Then it'd be Steve Mcqueen
John Wayne
Lee Marvin
Lee Van Cleef, not only is he a cowboy, he's a master ninja!!!
Charles Bronson
The Oak
Deniro
Bruce Willis
Mel Gibson
I'm a huge Willis fan, I just don't think anything compares to 70's tough guys... hell I'm still scared of Rip Torn, and that guy is hella funny now.
And The Rock has nothing on Joe Don Baker...
Guy's today that I wish would do more movies in lead roles...
Cole Hauser
Matthew McConaughey
Christian Bale
DMX (needs a serious role)
Honorable mention to:
Steven Seagal and Michael Biehn.... hell of a beginning but petered out quickly, especially Michael Beihn, he was da man!