Save A Fox. The owner can get a bit high-pitched, to put it mildly, but as a K-Pop fan that does not phase me at all :P
I also like the cockatoo (sp?) channels - the Big Two - Max, and Gotcha.
And for something to put on in the background I like Jenny Nicholson's long video essays (I'm dying for her to do something on K-Pop and also dreading it)