I finally reinstalled my PS3 with YDL 6.0 on a 320 GB HDD!
I don't own a LCD-TV with HDMI, but the HDMI->DVI cable works fine with my 24" monitor

I killed three screwdrivers to change the 40 GB HDD to a 320 GB one I had to drive to my grandfather for additional tools, now I owe him two screwdrivers After putting the HDD into a bench vise I managed it to get the last screw away to replace the disk

But now the dnetc-client is up and running again. Later I'll do some testing with samba and vnc and then make it headless again and put it back into the cabinet.