If someone offered me a mint VB SL/E 5.0L auto or manual for $12k i'd buy it. This is roughly what they were new. None of these are muscle cars though including HZ GTS or V2 Monaros. The proper Aussie GMH muscle cars (HK GTS327 through to LH L34) will always be worth good money, maybe not what they were at their peak but still will always be wanted. Until there is no fuel maybe.