How available parts are is relative... There are MANY platforms with a better selection and much better pricing. If you're not happy from the lack of availability or cost of your current platform I HIGHLY recommend you shop around with the online retailers to see how easy it is to find some of the items you consider common and also the parts that commonly need repaired or replaced.
There are a lot of people putting down a good amount of power with just the stock ECU and a fuel controller; Then there are those running the stock ECU with the MAFT Pro (AFM deletion, fuel controller, timing control, boost control and closed loop functionality... it's pretty much what you get if stay one step below a full stand alone). The most popular standalone EMS is probably AEM's. MS and Motec aren't uncommon. I haven't seen anyone run a EMS from another make.
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