S15 for sure, alfas in my opinion are overrated cars, the liberty is ok, JDM integra 2nd definately. So, S15! SR20DET is an engine lots of workshops etc have knowledge on, cheap mods, also it depends on how you drive it in melbourne as to not be one of the tosspots that drive them . Without touching internals this thing should touch 320 at the wheels, a mate of a mate did this in a 180 and thats a 93 model. DO IT! s15!