I also wanted to suggest Everyday Minerals Brushes. They're <$10 each and they're seriously the softest brushes I've ever felt. You can buy them as part of the Custom Face Kit which is any 6 items (you can choose all brushes if you want) for $34. There's often a % off code too, so it ends up being a really good deal.
http://www.everydayminerals.com/ind...art&page=shop.browse&category_id=20&Itemid=46
http://www.everydayminerals.com/ind...art&page=shop.browse&category_id=20&Itemid=46