The best advice I’ve heard when it comes to this kind of question of what to get went something like this.... Once you get started patching and making sounds, you’ll pretty quickly discover what you need to add when you think to yourself “I wish I could do this with it” and can’t with your what you already have.
I would suggest you consider adding a few smaller drum voice modules to the rack (in addition to the DFAM) and, maybe a dedicated multi-channel gate sequencer. Something like the SWT16 or Algorhythm (the two I use). That’s the one thing I wish I had done when I started was focused a little more on drum stuff than synth voices. You’ll probably want more varied drum/percussion sounds pretty quickly.
Check out my two racks on here you’ll see what I mean. One is what I currently have and the other (the wish list rack) is what I’d like to add.