Hey Ned!I can't say that I know that much about the Soundcraft Spirit mixers. After reading their specs and talking to several soundmen around town I'd say you're on the right track. You could also post a question on this bbs. Good luck! Let me know how you like the wave 8/24 ok?
I have a Soundcraft Studio LC16 mixer. It's well featured, flexible and extremely quiet. I have very few complaints. It's a pretty amazing setup for the price.