I'm contemplating buying a 2001+ Porsche 911 Turbo but I need to get some idea of what the likely maintenance costs will be. How much are brake pads and rotors? How much will a new clutch set me back? Are there any things that typically go wrong with these cars? Should I really buy the extended warranty? Even 0-60 in under 4 seconds isn't worth a divorce! Thanks for any helpful insights.