So glad you ran across the knobs video, it’s such a creative use of our modules, and we hope you found it inspiring!
Your short list of modules would be a perfect start since you have the essentials plus a bit extra for fun experimentation: a full synth voice (Surface), modulation (Chance), and effects (Data Bender)!
With Surface’s 7 models, you can actually create huge soundscapes with this small setup using Chance to modulate Surface, and capturing and manipulating audio with Data Bender. Definitely a solid beginning to modular!