After waiting a long time for the audio-sync of the videorecording to be fixed, I've decided I've waited long enough. For me, videorecording is THE most important feature, as I want to film my 2,5 yr old daughter growing up. So, I've decided to give up the good screen, the good sound, the GPS and the touchpad and go back to my trusty old Nokia N93.
So goodbye to the i8510, but also goodbye to all the people here. Thanks for your advice and comments.
BTW I probably wont be buying another Samsung. This device is supposed to be a camera-centric smartphone, and if they can't even manage to get a basic function working, they are clearly not taking their customers or this high-end product really seriously.