Hi Garfield,
I watched some videos recently on using the 512 Vector and with expander it seems like the most complete sequencer out there now for modular world. Pair it with Novation Launchpad and you can a great performance setup. You can do a lot with it all types of random/reverse and various modes. It looks easy to use as well and crisp clear screen. If the new Erica Synths Black Sequencer and Endorphin.es Ground control are not out by mid next year, I probably will go with the Vector and Doepfer monster base case so I can stack my two Doepfer 6U cases on it and have 300HP of space. Even with the Vector/expander/Hexmixer, I would have room for plenty of support modules and a few more percussion modules, more FX unit, and few complex oscillators and filters. That would give me all needed for a polyphonic setup for live modular performance and recording while being portable. No rush, I spent a lot already this year on my first Eurorack builds and having fun with them learning to craft tones.