Water ratios VS full mapping?

[1QuickBunny]

I have been running a system 2s for a long time on my N/A fiat. This is now installed on my latest toy, a T3 blown VW Cabriolet. Currently we are building a refrigerated water to air IC system. As this is an 8v with the turbo manifold directly below the intake, heat issues are our biggest concern.

Okay, specifically would a fully mappable setup be better? Or running a HSV hooked into the fuel map and using the differant jets to change the mix? I am probally moving away from the Mf2 as I have had some long term issues with it, primarly being able to know the exact map in it AND being able to repeat that map. The car currently has an Electromotive TEC-2 in it. Soon I am going over to a Megasquirts System for even more flexability. My goal is 250hp or so. So I don't neccisarly NEED the WI for agressive tuning, more as a larger safety net for the valves and motor.