I know second to nothing about it.
If it were me (which it sort of is - more on that later), I would want to have matching cd units, coils and plug wires. But I am really anal about some things.
Also, what you set out looks like a pretty penny!! I think the
Electromotive setup might be cheaper.
Steve Weiner at Rennsport Systems is very very knowledgeable about this stuff (and a very nice guy):
http://www.rennsportsystems.com/~porsche/2f.html
I am getting an SC based engine with a 964 dizzy. They dizzy has been modified to accept a MoTeC "chopper" plate. Ignition is controlled by MoTeC, with 2x Bosch ignition modules and 2x Bosch coils. To be honest, at the moment I don't know much about it and am pretty uncomfortable about saying what you can/can't should/shouldn't do.