I think the 40th anniversary GT will depreciate just as fast as a regular GT in the short term, but in the long term (& I really mean the loooong term) who knows. You've only got to take a look at the prices the classic 60's & 70's muscle cars are bringing now to realise this. A classic example is XC Cobra, a car decribed in in 1978 as a marginal classic, really nothing more than a styling exercise to clear out the last 400 hardtop bodyshells, yet I've seen asking prices of 70K plus. In 30 or 40 years any muscle bound BA, even our beloved T's, could be worth a mint.