so if i get one of these interfaces that will allow me to run the TOSlink from the traveller into that i will then get an extra 16 D.I's !! ??
almost right
it provides you with eight additional preamps, which you can run via adat (so you can 8 channels)
If you would go for something like the presonus digimax FS this will provide you also with 8 additional outputchannels (you'll need to run a second adat cable)
Alto has got an similair preamp to the ADA8000, only with much better preamps. It has got some great reviews.
And there's always the 8pre from motu. Aside from being a standalone firewire interface, you can hook it up similair to the ADA8000 to get an additional 8 preamps.
So if you're on a thight budget go for the behringer.
Otherwise spend them extra bugs on a alto MP8D or Motu 8pre
It will sound a whole lot better!