We've all got the bug in some way. It's why we're here. If you already have the Ringfade, then you might as well put it to use. I also have QPAS and Maths, so I have no complaints about them. Sometimes a big idea needs a big module.
I have the Ochd and the expander. I enjoy them quite a bit. The variety is good, and it can often act as a sort of ambient "sequencer" using the expander's triggers and the slow-stepped noise generators. The lack of knobs isn't as much of a problem as it seems. It's also a nice way to bind lots of things that aren't necessarily related and make them move together. It is also great for feedbacking into itself and making the modulation more unstable and unique. Otterly looks good too, but all these sound sources are going to be very thirsty for modulation, so getting more will be good.
Sounds like things are coming together well.