Dont forget the additional features which you get with ms:#
idle control
nos control
boost control
launch control
antilag
etc etc

these are all standard on ms but im pretty sure only the top end gotech will accomodate these.

If you are going to use the gotech ecu which obtains the cp from the dizzy then im pretty sure this wont have idle control. I bought this for my car but then sold it before fitting as quite a few people had informed me problems with starting and the engine hunting once warm, would imagine this to be pretty anoying on a road car but for a track car it probably would'nt matter.