For a great sequencer, I would check out the following:
WMD Metron
https://wmdevices.com/products/metron
Metron looks awesome for drums and bass. Here is what it can do even for a very small basic setup.
https://www.perfectcircuit.com/wmd-metron-black.html
512 Vector
http://www.five12.com/
IME Stillson Hammer MK2
http://www.industrialmusicelectronics.com/products/18
I am saving up for a new case and sequencer and mixer and fx setup. Would love a high end sequencer and mixer with all the expanders and support tools and FX/sampler to go with it. Very expensive part of modular next to building a setup with modular drum voices. Personally, I like the workflow of sequencer, mixer, FX and controls by my fingertips and the modules with oscillators and stuff separate all neatly patched for a show. Then I can get wild on the sequencer and filter controls and not accidentally unplug a patch cable.