If you want a bold, defining mascara Rimmel London Sexy Curves Mascara is perfect.  It comes in a variety of shades, including my favorite Extreme Black.  The unique brush helps really define lashes and gives them a bit of extra curl.  Not enough curling to really live up to the name of the product, but I actually liked that it didn't add too much since over-curled lashes look fake anyway.  Application is easy and the design of the brush helps reach inner and outter lashes.  It's easy to apply multiple coats although some times you will get a clump or two so don't wait too long in between...