Comedians that laugh at their jokes or keep a straight face?

I love comedians, but I notice that some of them laugh at their own jokes while others can always deliver with a straight face. I like both styles, but what is your opinion? Also who is your favorite comedian? My top three are

1) Lisa Lampanelli
2) Bill Maher
3) Amy Sedaris

dewitall:
here's my favorite and he keeps both a straight face and laughs at his jokes, my favorite being Jeff Dunham

J.A.M.:
Mitch Hedberg (RIP)
Jerry Seinfeld
Richard Pryor
Jim Norton
Wanda Sykes
Dave Chapelle
Chris Rock
Tom Papa
Kevin Smith (technically not a comedian, but if you watch his Evening With Kevin Smith films, it's like he is doing stand-up. They are hilarious.)

Rob:
1 - Chris Rock
2 - Jackie Martling
3- Old Jerry Lewis

I tend to like the ones that crack themselves up.

vashtivaughn:
I would have to say Vince Vaughn because that man is really funny. he can like talk really fast and stay all things sentences under breath and you know every single word that he be saying.

кσdι~:
I'd rather if they keep a straight face, I personally think it's not right to laugh at your jokes unless a bunch of other people are too... I mean, what if your joke isn't funny, and you are laughing your head off?

Props to the guy who likes Jeff Dunham... He's awesome!