Get a bigger case. TipTop Mantis is a favorite for it's value / high quality
If the 62hp case is too irresistible, here's a small self contained system would be fun to jam with
3u:
Pam's for sequencing gates and clocked modulation
Pico Seq for note sequencing
Plaits to generate a wide range of sounds
BIA for Kicks / Bass and weird sounds
Delta-V for function generator / VCA
Pico Drums for samples
Ghost for FX
1u:
Steppy for gate sequencing
Chainable stereo mixers