Chanel black satin chips soo easily i've heard. There are plenty of black nailpolishes out there now.. Opi has a good one named Black Onyx and if you're on a cheap kick, milani black magic.. i've had it on for 3 days and no chips yet.
I have both Chanel black satin & the new Noir Ceramic. The black polish that I love and that I think is better than both of these is for $2.97 at wal-mart. It is Rimmel's "Black Satin" (it has the same name)! I actually like it better and it lasts a lot longer.