Both: http://cdimage.debian.org/cdimage/weekly-builds/i386/iso-cd/debian-testing-i386-xfce+lxde-CD-1.iso http://cdimage.debian.org/cdimage/weekly-builds/amd64/iso-cd/debian-testing-amd64-xfce+lxde-CD-1.iso
Don't now about other architectures. Xfce/LXDE and more are missing on the ISO images. Installer doesn't offer a choice DE.
