I agree with you on the Circuit - I haven't owned one but I learned enough to teach someone else the basics (on an original, not the Tracks) and it's very well

I agree with you on the Circuit - I haven't owned one but I learned enough to teach someone else the basics (on an original, not the Tracks) and it's very well thought out. I had a (current model) Electribe and it was a bit frustrating, lots of features are technically there but too fiddly/time-consuming to use. The OP-Z is not in the Thomann list, but I find that to be excellent - and not expensive compared to the OP-1. A rare example of an experts-only UI, it needs to be learned properly in order to do anything really, but once you know how to do it it's nice. If Behringer ever releases their "HiroTribe" thing that might be a very compelling option on the budget end of the spectrum.