You should add Tantra Global.
http://tantra.gamenetworks.com/
Minimum Specifications:
RAM: 256 MB
Processor: Pentium III 800 MHz
VGA: 16MB 3D Video card
OS: Windows 98 ME, 2000, Vista
HDD: 1.2GB or more free space
Recommended Specifications:
RAM: 512 MB
Processor: Pentium IV 1.4 GHz
VGA: 64MB 3D Video card
OS: Windows Xp with Direct X 9.0 or higher
HDD: 1.2GB or more free space
Pretty low.