Larry spilled the "secret". Mine's not done yet, it will be dynotuned within the month and I hope to have some nice graphs to show. Just FYI, I'm sitting over $2k invested so far into the nitrous kit, because I'd rather do it right than blow something up. I'm running a NX Ford EFI Stage 1 kit, as Larry stated. I have an automatic bottle heater that works on bottle pressure, a dual purge kit, a digital RPM window switch, fuel pressure and nitrous pressure gauges in the engine bay (for looks and during dyno runs) and my wideband O2 gauge showed up today, as did my new fuel pump I doubt you would have a safe kit with less than $1000 dropped into it, and even then it would only be safe on a low shot.
I've done just about every performance mod that can be done to the ST, and the next step was supercharger or nitrous. I chose nitrous so that I could still have a nice daily driver when I wanted without the supercharger whine (though plans for that is now in the works). IMO, do not get the nitrous until you are out of performance mods to do, as you will not get the full benefit.