Thanks for the replies all. Expression is more or less sitting at the top of my list at the moment, I've played on a friend's Compact and it's just as easy to get around on as my Presonus was. Just trying to see what other options are there.
The manufacturers have given us some interesting choices, sometimes the differences are nuanced but important (input channel processing order, gate/comp/ducker side chains, etc). I think anyone looking for a new digital mixer to replace their GL2400 and some dbx comps & gates will find most of the previously named suspects to be acceptable.
I've touched/seen/played with a couple of the Soundcrafts, wasn't blown away by them but didn't find anything wrong that couldn't be fixed with some quality time on the desk. Same with X32 (and I now own it). Not blown away but it works fine.
I'd like to try a Qu.