My rack currently looks like the images above. Instead of the Mixology, I think I'm going to add the Mixup to save space (maybe 2).

A few more questions...

I need an additional sound source. Given my current setup, would I get more use out of something like the A-110-6, or something less traditional like the BIA? I definitely like the drum sounds you can get out of the BIA.

I'd also like to get an additional, small sequencer. The Tirana seems to be well reviewed. What are people's thoughts on this module in terms of what it delivers for its size?

The rest of the space will probably get filled with another envelope generator, clock source, external input (for pedals) and maybe a Disting. Are there any misc. modules that are particularly useful just to fill out the case? Maybe a 2hp Arp? Thanks folks.