Kim Professional Makeup Brushes: Really nice!

My brush collection is such a mixture of brands and styles. I have brushes that I love from both high-end as well as drugstore/value brush lines. For me, the questions are, what do I want this brush to do? And does it apply makeup effectively? Generally, I like a good mixture of stiffness and softness in my brushes (again, depending on what the function is of that particular brush). I am a