You found Kittel complicated but want something written in an advanced manner? That seems rather contradictory - Kittel is meant to be one of the more elementary level texts in the field. I personally dislike Kittel as well though - he doesn't explain a lot of concepts very well, and uses very sloppy mathematics at times. Condensed Matter Physics by Marder seems to be a pretty good book.
Hm, I always thought that Ashcroft&Mermin is one of the best solid-state textbooks on the market and, as any good textbook, surprisingly up-to-date although written a while ago, but I'm not a solid-state physicist myself.