Zone-VI developer- I can add my own benzo 1% if I need to. Defender D-55 is a great developer but it works better on Graded papers. I got some great tones with Ilford/D-55/Zone-ViI developer. It won't work well with Oriental,Forte,or Ilford VC papers. Glycin dev. are great but a PITA as they don't last well. Forte will go really good blue/black with some benzo added to the mix.
Happy Developing Peter