haltech, haltech, haltech... lol
Seriously if you want big numbers later on, (450-650rwhp) just bite the bullet and get the Stand alone. $300 for the$AFC, $550 JWT, more money for the high imp. side feeds (sometimes up to 2x more money).
When you can spend 1000 for a haltech or SDS, and get low impedence inj ($65 a pop for 72lb) and a 100 dollar rail. All for teh same price and limitless adjustability. Sorry to invade the Nissan Forum, but its all relative.
Hope this helps...
BTW, I would have never made the power I did on my motor without a stand alone...