Rodney Dangerfield. Have you not seen the shit he got away with in all his movies just by cracking a few jokes and insulting a few stiffs? But seriously, I'm not too picky. Any of the above, plus I'd throw in Liam Neeson and Robbie MacGregor (Aussie voice talent).
Robert De Niro hands down. He has that authoritative voice, like he is always running the show. e.g. Heat.
Authoritative, yes, but I think he gets his way by just sounding pissed off. Johnny Cash on the other hand does it with a voice so deep and resonant that you just want to hear the next thing out of his mouth. It's authoritative without being demanding. Warm, yet strong. Poignant performance right there.
Kevin Conroy. Who is that? He's motherfucking Batman, that's who. And has been more often and for longer than anyone else. Check out the animated movies, TV series, and video games.
Claudia Black. She's an Australian actresss who did a couple of sci-fi shows and now does voiceover work for video games (Uncharted and Gears of War 3 most notably).
Sam Elliott hands down. His voice is incredible. Just a deep as hell manly voice. I've heard several women say they would fuck him based on that alone. If I'm not mistaken one of the TiBettes also said something to that effect as well some time ago.
I have two. Nerd call out for Steve Blum. Look him up, if you've played videogames or ever watched a cartoon/anime, you've hard his voice. Also, Barry White. What the fuck is wrong with you honkies? 3 pages in and no Barry White?
Both are genuinely outstanding voices, but Barry White would sound weird as fuck coming from anyone except a 400-pound black dude. Maybe that works for you, but I'm a skinny white guy.
When I first read Barry White as a white guy, for some twisted reason my mind instantly pictured the changeroom scene from Bad Santa with Barry Whites voice instead of Billy Bob Thorntons "You ain't gonna shit right for a week" (Michael Clarke Duncan would work real well here to) There is a second part to this currently unanswered though. Do you sound like this to yourself, but not to everyone else, or vice versa? People could get pretty damned smug walking around thinking they sound like Barry White and hitting every karaoke bar while everyone else hears the sound of 30 cats in a blender.
Steve Blum is a pretty fantastic choice. I like my own voice a lot - it's a good radio voice, and I'd like to try doing voiceovers sometime - just wish I kept up the singing more regularly. There are a ton of singers I admire. I'd sacrifice a small child to Satan to have Chris Cornell's range - I'm a bass, can't hit his mid-range in full voice, let alone the high notes. Check out his head voice and above around 3:26: Also got to love the smoke in Sly Stone's voice. That's the kind of thing you can't learn how to do. And Dean Martin sings in a sort of strange, sleepy, lyrical way, and it's fantastic. I could think of more, but I'll leave you with this, since this guy has an extremely unique voice and it's actually in my range: