from what a mechanic mate who builds 500kw hpi sr20's said, go Motec, or Autronic. at very least Haltech. but it all depends on the tuner your going with and what he's ultimately comfortable with. as well as budget.
2400 would get a new motec m400 in and wired as well as tuned. but that was sr prices.
that being said, a friend of mine who has a 350rwkw rb25 runs a haltech ev11, and the tuner isnt all that flash therefore the car doesnt run too good (takes ages to start cold).
sorry, that doesnt help a lot.
where abouts are you?
joe