Soundcraft Si Impact went from 32+4 stereo to 64+8 stereo with the V2 update...free of charge. 32x16 on the back and 2 card slots (64x64 & 64x32) for stage boxes or other I/O
Lots of desk for around $2500 MAP
I've used the Expression and Impact consoles a bunch and they are a good value, but I have always found the lack of keying/sidechaining and AMM absolutely astounding. I can't think of a digital mixer that doesn't have [at LEAST] those built-in. Surely a firmware upgrade would be all that is needed - I think doing that would put them in a unique spot due to the fairly high channel count (80 mix channels on the Impact).