Then you want an A1 - it does 80% of that as standard, and if you pay an extra £700 you get 99% of that in the car.
Large colour screen? Check (which also supports videos), standard. Screen is far and away from the rest of the "head unit" also.
Voice Control + Steering Wheel controls? Check, standard
SDHC Slot (2 of them)? Check, standard
USB Port in glovebox? Check - but optional extra
3.5mm aux in - Check, Standard
Single Optical Slot - Check, standard (MP3 et al), Extra if you want DVD support.
Bluetooth support? Standard feature, plays music with track info
Built in hard drive? Extra but yup you can have it, loaded via SD/USB
OK so you have to buy a whole new car to get this, but it does exist already, and hopefully will become standard in more and more cars over the next few years