Jack -- your seup is similar in some ways to mine. I use an internal SATA for audio too. Sounds like from what Christian said, as long as the library is split into orchestral sections, JBOD will be the way to go (as I'm doing now).
I'm not sure we'll ever see an RTAS version of the VSL VI, though - it might be a wrapper (hope not). That's the reason I'm thinking of setting up my new Quad without ProTools (I use DP as a front-end to PT). Hope we can find out more specifics about VSL's plan's for RTAS soon -- I'd like to get moving on my setup.
I'm not sure we'll ever see an RTAS version of the VSL VI, though - it might be a wrapper (hope not). That's the reason I'm thinking of setting up my new Quad without ProTools (I use DP as a front-end to PT). Hope we can find out more specifics about VSL's plan's for RTAS soon -- I'd like to get moving on my setup.