[LAU] linux studio in Rio. help with configuration

Hi all, Here in Rio de Janeiro, Brasil, we`re making an studio in circo voador<http://www.circovoador.com.br/>where there will be research and free lessons of áudio production on linux. And we also want to record our shows in 24 separated channels. I`m now searching for the best áudio hardware configuration for us. The biggest problem, is that here in Brazil we pay a lot of taxes importing audio equipament, what makes it very very expensive and give us few options o choose. So, what I want to ask is if you guys could suggest me a nice and cheap configuration to record 24 channels at 24/48khz on ardour. I was thinking in something like: RME hdsp 9652 + 3 behringers ada 8000 connected via optical adat. is that an ok configuration (that works)? does someone use it? there's something better then the ada 8000 in this price range? thanks a lot for your patience! Surian