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What kinds of sounds are you producing?? Playing live, or mainly studio use?
-- vectrospectre
Like you, I am interested in a wide variety of music so I wanted something flexible. I just wrapped up a raw, glitchy, post-punkish art project thing, but I also love Boards of Canada, Kraftwerk, Tangerine Dream, Autechre, Depeche Mode, Brian Eno, Tortoise, Richie Hawtin, Japan, Cocteau Twins, harsh noise... you name it. I basically love any and all synth and sample based music. I may decide to play some minimal techno live, but I mostly just have fun creating at home. I just added a Sequential Prophet Rev2 to my rig, so I'm working towards a more polished and focused sound now.
I'm not that familiar with Tempi, so I can't comment on it specifically, but with all of the percussion modules you have planned, you are going to want a way to program each of them at individual meters/rhythms. A single multed clock won't really do that. The Eloquencer has eight CV/gate channels, but you will eat those up pretty quick with all of the voices/envelopes/VCAs, so with Pam's 8 (or 12 w/ the expander) additional clocks you can program more complex rhythms. That's how I use it, anyway. Ornament & Crime may be able to do some of that too, but I've shied away from that module's user interface. I don't enjoy complex menus, but you may work better that way.
The Performance Mixer is definitely overkill if you are mainly just using the ES9 and Ableton.
Let us know how you progress in this journey!