Hi there,
I was one of the first owners of the IS350 F-Sport in Australia and can share with you some of my ownership experience which hopefully answers some of your questions.
The ride on the F Sport is quite harsh for a luxury car but it is an excellent compromise for a luxury sport car. In the past I have owned the MX-5 (NC model) and recently test drove the Maserati Cambiocorssa (sorry for the misspelling), I can advise that the F Sport is an excellent driver vehicle in terms of ride compliance and acceleration.
Unfortunately, the F Sport inherited the 2006 IS250 interior which means that most of the functionalities you find in the modern BMW E90 will not be there. (Note, another of my family member owns a BMW E90 320d which I have checked out the sound and satellite navigation system).
My IS350 F Sport will NOT play Iphone 3GS and Iphone 4. There are heavy statics in the speakers. This is again confirmed by the owner's manual. As such, all the functions which you'd like to achieve described above will not be possible. Also, there is NO bluetooth streaming.
However, the Ipod Touch will integrate and connect directly via USB. The Mark Levinson sound system is EXCELLENT. It is highly recommended that you play from an original DVD disc and select the DTS sound option. You will be amazed by the output!
In terms of the phone function, you cannot enter numbers while driving but can use the speed dial if you have programmed the numbers. Similarly, with the sat nav, you cannot enter new destinations while driving but can select the pre-programmed addresses.
Hope the above is useful, pleae do not hesitate to contact me should you have any further queries. I have a few pictures of my car in the photo/gallery section of this website.
All the best with your purchasing decision!
Regards,
D