Originally Posted by BMW //MPOWER
The 996 turbo won't depreciate anywhere near as quickly as the M3, however a lot of that saving will go in servicing and maintenance costs, hence financially there is pretty much no difference.
So it pretty much comes down to which car you prefer more.
In the states, a 996 turbo's value sinks like a big rock in deep water. The 997tt will likely follow suit. However, from a $65k pricepoint the depreciation will slow dramatically. E46 M3's held up far better than any NA 996 or 997. That might not be the case with the E9x, but who knows yet.