which ignition to get?

whats up. Im deciding on what type of ignition to upgrade to. So far my mind is set on the MSD SCI ignition with the blaster 2 coil. im gonna have to also get the dristributor cap from MSD to make this work. is this a good set up? the car will most likely stay N/A for a while.
what about the msd 6A? which is better