Thanks for your inputs. I just found this clock upgrade kit on ebay:
This looks really interesting to me.
It runs two clocks for 44.1k and 48k and the multiples from these (as the stock one does).
This price is also interesting - however the Audio-GD Digital Interface (version A, USD190) is great value (for what it is) compared to this.
Also found this complete digital upgrade offer from the same company:
I wonder if the extra 115 pounds is worth it ...
Edited by LarsHP - 4/17/11 at 1:59pm