I think I've mentioned this before, but the first gen Corsair M65 is just about perfect for me. To be specific,
Just enough buttons
Built like a brick shithouse
Finicky with USB 3.0 ports
Soaks in the oils from skin
Teflon feet don't have the best adhesive
Cable still has kinks from when it was in the packaging, FIVE YEARS AGO.
Sensor is love or hate
For me the size is the most important. I used to use one of those cheapo Logitech wireless mice, but with my hybrid palm grip it was simply too small for me to use comfortably. Weight isn't as important because I can just toss in a poly bag filled with lead shot or tungsten powder or something. For me the sensor doesn't matter too much as long as it's "good enough". The PMW3360 would be nice and all, but a more basic one would be fine as well. I think my mouse uses the ADNS 9800 and I don't have any issues with it. A flimsy mouse has no place on my desk however.
Oh, and being able to take it apart would be nice. Sometimes you really just want to mod something, ya know?
In a recent video there was a comment about a keyboard. If that happens, any chance of getting it in a kit? I know it's just me being picky, but I like Clears, and those are hard to find in a keyboard style I like.