I'd say, if you find joy in soldering and DIY electronics, something like this could be great. It's hard to say without hearing it...

I really think a first synth (I know you already have one, but it seems like you're unhappy with it...), should be a polyphonic one. I went a similar route as you, but with a Behringer Neutron, and it was fun, but I immediately wanted something more.

Anyway, If you've got the itch for a new instrument, get a Microfreak, or a Minifreak from Arturia instead of either of these. Microfreak is paraphonic, so not full polyphony, but you can play chords, and when I use mine I don't miss having 1 filter per voice.