The money you will spend on an Autronic or a MoTeC will be well worth it, I have two Mazda's and one has MoTeC the other Autronic, I work with lots of types of ECU's (tuning) and can tell you after "owning" two of the top regarded brands that they have this reputation for a reason !

Save your money and spend ONLY once on a top quality ECU, the amount you spend will long be a distant memory when you see just how damn good these two ECU's are, all else realy does look substandard in comparison

Either Autronic SM2 or Motec M4PRO would be the ones to look at ......... all the others take your pick there all about the same in price, function, features.

90% of Australians who pick Microtech do so for a reason because its easy, dont confuse simplicity/cheapness for quality & function

Haltech E6X would be my next pick after these two for your application, and would be the first choice if your on a budget. All of the above require skilled operators to initialy set up and tune, so maybe look what ROTARY specialists in your area are familiar with then narrow down your selection from there.