I know I plug him a lot, but Kyle Webster's brushes are really unrivaled when it comes to PS brush packs.
http://www.kyletwebster.com/
He has a few free ones! Give them a try. The Animator Pencil especially is an incredibly comfortable sketching brush.
http://www.kyletwebster.com/
He has a few free ones! Give them a try. The Animator Pencil especially is an incredibly comfortable sketching brush.