AE86 ECUs

[Ivan141]

The ECU is as good as the mechanic who tunes it. In the miata world they had great support for the LINK ecu, which is basically a dinosaur and shouldn't have worked. So many maps were made and shared and so many people used only this system that lots of people got good at making them work great.
Either you take the time to learn and tune it yourself or go with the system that your local tuner is most familiar with. Its the fastest and cheapest way to get to a state of tune thats better then the stock ecu (which by the way is pretty darn good).
Megasquirt is as cheap as it gets.. although you do have to know a lot about the ecu to make it work well. (usually lots of troubleshooting to be done).

If money is no object: buy motec: it has blend algorithms that work REALLY well with wild cams and ITB's
Second on the list for me would be the AEM ecu. Great features, great price. Most of the bugs have been ironed out by now.