The one thing about PC gaming that is difficult to keep up with, are the rigorous system requirements that exsist to play many titles that are already on a console. Street Fighter IV seems to buck this trend with fairly reasonable system requirements. I think we’re dealing with more of a beautiful art style, than performance intensive graphics. Check out the specs below!
Minimum
OS: Windows XP
CPU: Intel Pentium4 2.0GHz or higher
RAM: 1GB or higher
HDD: 10GB of free space or more
Video Card: DirectX 9.0c/Shader3.0 or higher compatible, NVIDIA GeForce6600 series, ATI Radeon(TM) X1600 or higher or higher, VRAM ?256MB or higher
Sound: DirectSound compatible, DirectX 9.0c (or higher) compatible
Input Devices: Mouse, Keyboard
Maximum
OS: Windows Vista
CPU: Intel Core2Duo 2.0GHz or higher
RAM: 2GB or higher
HDD: 10GB of free space or more
Video Card: DirectX 9.0c/Shader3.0 or higher compatible, NVIDIA GeForce8600 series or higher, ATI Radeon(TM) X 1900 or higher, VRAM ?512MB or higher
Sound: DirectSound compatible, DirectX 9.0c (or higher) compatible
Input Devices: Gamepad ?Xbox360 Controller for Windows

This is incredibly reasonable.
Except for the 10GB! Is that how much it is going to take up? Wow…
@ Chris Carter,
I agree it is reasonable, and many PC games are beginning to move toward the duo core realm, which is expected. 10GB is a lot, but storage is getting cheaper. You can get 1TB for under a $100.
Check out the specs for the PC version of Terminator Salvation. It recommends a Quad Core. You’re better off buying a new Xbox 360 or a used PS3 than upgrading your processor to that. The prices are just about the same.