F.E.A.R. recommends at least 1GB of RAM, but you know what games system requirements are like: Add x2 for everything lol
2GB of RAM maybe a little OTT now, but with Windows Vista soon to be released and SLI GFX Cards now the norm, anything less in the near future will be crazy. Soon you'll be talking of 512MB machines like they where the 8MB machines of old.
The machine I am currently building has the capacity for 4GB RAM and I intend to use it to its full capacity as soon as possible. "The more I buy now the less I have to upgrade in the future" is my way of thinking. I rarely just upgrade a machine, I prefer putting up with it until I can build the best machine I can afford.
But then again I am a bit of a techno junky.....