i would go for the 18" Monaro style wheels - they are a five spoke wheel with machined face and black insert which look good on most commodores. PM the boys at the wheel deal to see if they can get a price, otherwise search ebay!
to put them on yourself you only need your stock holden jack and wrench - its just like changing a spare tyre. the only thing i would recommend is a front and rear wheel alignment ($50) to ensure your tyres wear evenly.
God invented shit. Ford put wheels on it.