my eurorack

Hi there im really new to Eurorack and so far what you see is what i got. I intend to use my Eurorack with an Arturia Keystep and some Pocket Operators from Teenage Engineering. Is there any Module im absolutely missing out that i need for this to work? I for sure want to get a new Oscillator, since Chips really isn't it even tho i like its quirkiness/brokeness. Which Oscillator should i get, what other modules would be great to get? The goal i have is to make some rather dark reverbed sounds, with some modulation possibilities.