Quattroporte Depreciation

I am not really currently in the spot to purchse a brand new Maserati QP. Anyways, in two...maybe three years time after I put my kids through university and get around to selling my rental properties I will be able to pursche one. Now, what is the depreciation like on the Quattroporte? Where do you see the prices on a used Quattroporte in two to three years? Thanks!