im building a 2.0 zvh and im going to use megaswuirt from m-tecch, comes with a good warranty and tech support. Only costs £440 with loom and if you want them to map it then its £45 per hour. Has all the features as the big boys, anti lag, launch control, boost control, auxiliary options etc. Does batch, semi and full sequential fuelling. I know a lot of people will probably shoot me down with this but every one I have spoke to who actually use it swear by it.

Hope this is of some help