1) MacBookPro : OS + audio software
2) 1 HD on FW400 for samples (VSL, stylus RMX)
3) 1 HD on FW800 for audio recordings, projects
4) Xite on the express card (fastest, "no" latency)
I am really happy that SC has chosen the express card while many audio companies (except Apogee) only make Firewire audio products. As it is DSP based, the Xite means power and a huge amount of data transfers so the express card is the fastest way .. Furthermore streaming samples can work very well on FW800/400 connections and external HD on firwire can work perfectly. And a DSP product deserves the best : express card ! And above all, a host of audio stuff seems to have problems with the new firewire (Agere) of the macbook pro so except if you have MBP made before nov2007 or a PC laptotp, buying firewire products (RME, Presonus forums talk about this firewire issue) is currently a bit risky. So an express card audio interface is the less risky option (soniccore or Apogee but may be there are other brands ?).
That's why I do think that the Xite (preamp+in/outs+plugins+power) + laptotp (here a macbook pro) may become a killing mobile DAW in 2008. The express card option is, to me, one of the most inoovative idea of Soniccore, really ... Even pro audio reviews has to face the truth : firewire dsp products (ex : TC power core) have to cope with latency problems. The express card way is just the fastest ...
I think I will get rid of my racked PC (to curb the Xite price

Jonathan