ummm .... that 400hp one would be a HSV car, which would make it more expensive and much harder to get one here. The GTO is more powerfull than the CV8. The CV8 has a few nice things, climate control, side air bags, backup sensors, memory seats. The front fasica could be replaced with a HSV or Holden one.
it might be easier to import one for the saudi (lumina ss) .... england is getting them this summer too (vaxhaul monaro)