simtek ecu - hmmmm may have installed a couple of hundred of them
you won't need a resistor if you went simtek as the simtek doesnt use the egt sensor.
SimTek is good, 2 maps, fast processor, maps are high definition and car will run very smooth.. option of antilag and launch control.
If you want antilag and launch control then also worth considering a Syvecs ecu which is only slightly more expensive on a newage but is even more advanced.
Simon