I am setting up for my new rig, I 'm caught between one gig or two. I see the CORSAIR XMS 1GB (2 x 512MB) 184-Pin DDR SDRAM DDR 400 (PC 3200) Unbuffered Dual going for $123, But is this enough or should I use two gigs? I 'm a gamer and I like to run more then one application at a time I hate having to turn things off just to run an application.The new system will have a Dfi lan party sli mobo / Amd 4000 sandy /GF 7800 gt / antec 500 watt smartpower / Maxtor DiamondMax 250GB 7200 RPM 16MB Cache Serial ATA150 Hard Drive.