In the market to buy a used 2005 Maserati Quattroporte or 2006 BMW M5. I can't decide between the two. Both have relatively the same miles and I'm also looking for a good resale value Or should I go with an 2007 Audi RS4
Well, if it were me, I'd keep in mind that BMW and Audi dealers are relatively easy to find should you ever need to have the vehicle repaired. Maserati dealers, or techs that are familiar with fixing them are a little harder to come by.
Unless, of course, you would be servicing them yourself.
Resale value on the Maserati is really going to boil down to selling it at the right time, when there is that certain person who wants that car, which is impossible to determine. I would take a guess that the resale value of the Maserati is the highest of the three, but it might not sell as quickly as you'd like, for the reasons I've stated above.
BMW's and Audi's comparable vehicles are pretty close in resale value - should you decide to sell you'll probably be able to make the sale fairly quickly