Novation Circuit and Novation Circuit Mono Station - Second Thoughts

It has been a little over two weeks now with the Novation Circuits. I am having a good time with them, but I have quickly hit a wall with the learning curve. The quick jam sessions are fun, but taking the next step to actually try and create some songs are proving difficult for me. I think this is mostly due to me needing to actually learn the kits. I have gone through the quick start guides, but a full reading of the manuals is in order, especially since there have been numerous firmware updates to these things over the past year. 

I am already beginning to think about what sort of additional equipment I might want to add to these to build out the sound palate. A modular synth is enticing and I have seen several setups using one. 

The Roland Aira line looks like it could also be an excellent complimentary set of equipment for the Circuits.  

The Aira line not only has the looks, but possibly the interface for a sort of hands on performance aspect to what I want to do with these Circuits. 

The MX-1 mixer looks perfect for this sort of setup with 6 audio inputs, AIRA integration and live performance effects. Where I go from there is the real question. Do I need the TB-3 baseline synth? How about the System 1M for deeper synthesis, or perhaps the SP-404A for more percussion and sampling. 

I don't know where I will end up, but I think the next couple of months could be fun.