I Personally wouldnt go the simmons. Sure they might look OK, but every tom dick and harry has them now. They used to be seen as a prestigeous wheel, now every second commodore has them.
If its a showcar, go for something original - or at least something that hasnt been seen on every other car. (i don't mean some stupid chrome ricey 17" wheels either, though).
Your going to spend $4000 on a paint job, $$$$$ on a stereo and custom interior - Then the first group of young blokes to see the final product will say "Hey boys, its got Simmons like the ones on my Commodore".
Well maybe not - but you can see the point i am making.