I've loved stand up since I was a kid. My faves:
Dave Attell (Skanks For The Memories might be one of the best ever)
Bernie Mac (a helluva nice guy too)
Dennis Miller (back when he was funny...he seemed to lose it in the mid to late 90's for me....)
I also like the small timers that populate the Roast circuit; Lisa Lampenelli, Greg Giraldo, etc. Those roasts are hysterical. And though not a true stand up, Robert Smigel is a god.
And of course, the classics never die: Carlin, Rodney, Pryor, Redd Foxx, Don Rickles, etc. The HOFers of stand up comedy.
As you can see, I like my comedy at least somewhat educational and filthy.
I will admit to getting a few chuckles from Ron White and Rodney Carrington although "redneck" or "blue collar" comedy isn't thing.
NOT FUNNY: Rita Rudner, Paula Poundstone, Larry The Cable Guy, Jeff Foxworthy, Billy Crystal, Robin Williams post 1983, and strangely enough, Jerry Seinfeld. Loved the show, but tire of his standup quickly.