If you want to stay EECV, get yourself an FRS PCM and sensors, then have it remapped using e.g. SCT/Dreamscience (Jamie @ Jamsport is supposed to be good with this). Staying EEC means you can keep factory clocks, security, tcs (if the zs has it??) etc.

The other option is keep the standard PCM for driving the clocks etc, and run injection/ignition/boost control from an aftermarket ECU. For your purposes anything from a Megasquirt to Emerald/Omex/DTA would make most sense, IMHO. Anything more would be overkill.

Chris