Hans - how long do you plan on keeping it before swapping for your next car? If it is under 5 years, you will probably see a higher operating cost for the IS-F vs M3. I cringe at the bill every time (5K miles) that I have to take my GS in. It might be nice that a guy in a tux gets me a coffee and breakfast sandwich
, but they rape you on the service.
If you plan on keeping for a long time, than Lexus are great. I work with a guy that has 245K on his GS300.