If you think about it gotech is just changing the fueling, so how can that massively affect the torque?? Its not really possible is it?
And fitting gotech wouldn't knacker your engine, because you can just fit gotech and expect massive power increase! But you may get better power delivery etc. and then you know you have the management to run much more.. So in time you can upgrade your engine.. get the ecu re mapped then ur well away!!
But I cant see much point in spending the money if you have a standard engine - seems quite pointless. Make the best use of ur KE, unless you intend on more engine mods.
I have gotech, and im happy with it!
Hope this helps!