While it's a damn shame to have you come to us under these circumstances, it sounds like you're dealing with either:
a) a group of amateurs or
b) determined vandals.

Professional thieves would have made off with the car on the first try.

First off, the CLUB is a joke. A hacksaw through the steering wheel can defeat a Club in seconds, without damaging the steering column. The Autoloc is a better deterrent, but it's not infallible. There are tools available to repo-men that can defeat it as well.

Secondly, the 2000 and 2001 GSR have a resistor-coded key that talks to the ECU in order to start the car. Since it sounds like the thieves have demolished your ECU, that's going to be the most expensive bit to replace.

Again, a pro would have swapped in an ECU from an earlier model year GSR to defeat this feature once the ignition had been punched. I believe as a temporary solution, you could run a 1997-1999 GSR ECU, assuming the ignition switch is still functioning.

Also, do you have comprehensive insurance?
Did you have some sort of argument with some people...
Is there anyone who would vandalize your car to get back at you?

If you're near a city of any size, file a police report and request that the local PD make a few passes during the next few days. And if you're out in the boondocks, it's time to pick up a 12 gauge.