$90?! Ouch! I think good brushes are worth paying for, but that seems a bit exorbitant. Check out Lancome brushes - they're not nearly as pricey, and very good quality. They also come with a lifetime warranty. (I'm really in love with their foundation brush - gives me a very clean look, and I think I use less foundation when I use it.)

Anyone ever visited makeupalley.com? They have loads of beauty product reviews. Paula Begouin's books and website are also worthwhile for good information.