Your mouth to God's south.
Male - 23 Years Old
While I don't have any particular ones offhand, I know I've heard my fair share of metal, mathrock, and other stuff in that vein that didn't make me want to listen to it any further, but kept me really amazed throughout as far as technical prowess. Between The Buried and Me and Tool probably fall under this category.
EDIT: Also, what Sean said with the exception of 'Karma Police' and 'High and Dry.'