I tend to stay away from the "big names" because I tend to find them ... excessive? Like they're trying to hard for what they're actually doing. Rooster Teeth is as big as I go, and they're already really big. I suppose Muselk is pretty popular, too, as his videos usually hit 100k views on a regular basis. On the other end of the spectrum, FallFromGrace on Twitch has, I think, like 100 subscribers?