The PC version could be the best version of GTAIV.
What's the cost, more waiting and lots of cash on a new system.
Two week delay: http://www.joystiq.com/2008/10/28/retail-listings-indicate-grand-theft-auto-iv-pc-delay/
New system requirements:
Minimum System Requirements
OS: Windows Vista - Service Pack 1 / XP - Service Pack 3
Processor: Intel Core 2 Duo 1.8Ghz, AMD Athlon X2 64 2.4Ghz
Memory: 1.5GB, 16GB Free Hard Drive Space
Video Card: 256MB NVIDIA 7900 / 256MB ATI X1900
Recommended System Requirements
OS: Windows Vista - Service Pack 1 / XP - Service Pack 3
Processor: Intel Core 2 Quad 2.4Ghz, AMD Phenom X3 2.1Ghz
Memory: 2 GB (Windows XP) 2.5 GB (Windows Vista)
18 GB Free Hard Drive Space
Video Card: 512MB NVIDIA 8600 / 512MB ATI 3870
They are very high much more than any other PC game including Crysis.
Is it worth it? Find out here: http://www.gamesradar.com/pc/grand-theft-auto-iv/preview/grand-theft-auto-iv-is-the-pc-version-the-best/a-200810301323482004/g-2008080416222952067