That's pretty close to the minimum, although I am *not* annoucing official specs at this point.
Unofficially, a 2.8, 1 gig, and an x800 or x850 (or nvidia equvalent) would be good.
Unofficially, a 3.0, 2 gigs, and an x1800 or higher (or nvidia equivalent) plus pci-express and a fast FSB would be the high mark.
Again, UNOFFICIAL. We have a lot of optimizing left to do and prices will continue to drop and new cards and machine configs will become available between now and release.
Source: Aradune Mithara 08/12/06
It's too early to announce Vanguard's hardware, memory, or storage requirements.
Source: Official FAQ