Does such a thing exist? Ideally, with a 20+gb HD for MP3s or (better)
WMAs. Either as an add-on or a complete head unit. Oh, and Bluetooth +
mic for handsfree telephone? Oh, and either a really good system for
recording radio on a timer or an SD card slot.

I've got DAB54 and, TBH, I hate it. I record a couple of hours of radio
on my Roberts then play it back in the car. The first problem is that
the DAB54 is fickle. Sometimes it'll play, sometime it won't. If it
refuses, it normally can be kick-started by playing an mp3 CD and then
switching back to SD. However, god forbid you need to fast forward in a
single track by more than a couple of seconds - it takes 6 minutes of
holding down a button to fast forward 1 hour. What a lousey user
interface

I'm about to buy a new car and will need a DAB radio ASAP, so any
suggestions greatfully received.