Two, actually. To clarify, I would use the PCI video card to drive a second monitor, since I highly doubt Apple will ship a system at that price point with dual-head capability. I highly doubt Apple will ship a system at that price point, period. :)
I hate sites like Think Secret. People really ought to know better than to put stock in anything they publish, but sometimes you just can't help getting caught up in the possibilities, remote as they may be. The main offender this year is the "headless" G4 iMac for $499, apparently geared...