Why don't you stick with digifant system?
If you are going to throw the crapy distributor system or boost more that 1.6 bar, ok, go on... BUT
Digi is prety good for turbo applications too, plus Andy is a digi guru, he will sort almost any problem.
Also, emerald does not have knock control (please correct me if i am wrong)
Think that you need:
ECU
Loom (cables, plugs, connectors)
A few sensors if you stick with distributor
and of course, a lot of TIME