Junji Ito would be classified as guro manga artist. His stuff is more geared towards horror and just all around weird stuff.
I really like him, Tomie would be my FAVORITE of his work. Then I'd either choose Uzumaki or Gyo
As for Ero-guro, I kind of don't like the stuff that is like "Lol look anime girl with big boobs being decapitated". I like the stuff that is weird, violent, gross, and bloody, but that still has a touch of artistic depth to it. I really like Maruo because a lot of his stuff is so strange. The gore is amazing. I really like "The Laughing Vampire". A lot of his stuff has these weird lines in it that are amazing. I forgot which this one was in but I love it for some reason:
I'm not sure if that is the exact quote but you get the picture.
As for Gurochan, I only lurk there for the art. I never really read any of the stuff lol. I also kind of don't like it because of all the LOL ANIME GURL stuff. I find that boring. I really like some of the other things. ESPECIALLY when it has to do with males. That's the main reason I go there because I really like male ero-guro stuff, and I can always find really good things there.