...and number of computers.
2-6 computers ideally. With current limitations it's not ideal to have everything on one PC only. Granted you didn't look into the new VIs at all and are only interested in the sample libraries:
The "complete" VSL is only availible for GigaStudio, and this is taking almost everything it can get... 1.5 or 2GB RAM, at least 2.4 GHz CPU, two 7200rpm harddrives (1 for the OS and data, 1 for the samples/streaming), a GSIF compatible soundcard for each PC. I'm running Opus 1 from 1 PC currently, but I'm experiencing some limitations and having 2 PCs would be better. You can of course even run the complete set from 1 PC, but you'd have to bounce, load/reload a lot then.
I and others wrote quite some lines about this topic in this or the Giga section already, perhaps you can find something worth for you in a search.
Hope this helps,
PolarBear