Best Ipod Adaptor

[ike301]

Yes, this is probably a repeat, but thought I'd revisit since technology is changing / upgrading so fast.

what's the best ipod adaptor avail?

-non-FM transmitter. i am going to have a car shop install
-i want the play list to scroll either on the radio on in my console above the steering wheel
-ability to scroll (and fast forward) songs via my steering wheel control
-non-battery draining while engine is off (i.e. if i left the ipod attached/docked while i am not in the car at home but yet possibly charging when using.)

am i asking too much or is this available? what brand? how much? reviews?

THANKS!