Well, there are always the obvious ones.. so I'm gonna go with my favorite Silver Fox, Mark Harmon. I don't usually go for older guys, but he and Hugh Laurie have something going for them.
As a young guy-- I might have been into him in the 80s if I wasn't in pre-school... People mag's Sexiest Man Alive 1986
And more recent, playing USMC Gunnery Sergeant (ret.) Leroy Jethro Gibbs on NCIS
Also note: Michael Weatherly {Anthony DiNozzo} is def. worthy as well, but Gibb's has the eyes!