I have postponed the decision as things became a bit more complicated. Not just the website is involved, but a webshop has to be started also. I'm in the middle of choosing a webshop now. The wish is a CMS-based shop and I'm still thinking of Drupal. The shop would be Ubercart in that case.
The point is that it's bad timing to start an unfamiliar CMS and an unfamiliar webshop. It's a matter of priorities.
I probably will postpone the whole CMS-operation and take osCommerce as a webshop, since I'm familiar with that one. It means my time-investment in osCommerce will eventually be lost, but given the circumstances it seems to be the best decision.