Well here they are...
Recommended System Requirements
OS - Windows XP / Vista
Processor - Intel Core 2 DUO @ 2.2GHz or AMD Athlon 64 X2 4400+
Memory - 2.0 GB RAM
GPU - NVIDIA GeForce 8800 GTS/640 or similar
Minimum System Requirements
OS - Windows XP or Windows Vista
Processor - 2.8 GHz or faster (XP) or 3.2 GHz or faster* (Vista)
Memory - 1.0 GB RAM (XP) or 1.5 GB RAM (Vista)
Video Card -256 MB**
Hard Drive - 12GB
Sound Card - DirectX 9.0c compatible
* Supported Processors: Intel Pentium 4 2.8 GHz (3.2 GHz for Vista) or faster, Intel Core 2.0 GHz (2.2 GHz for Vista) or faster, AMD Athlon 2800+ (3200+ for Vista) or faster
** Supported chipsets: NVIDIA GeForce 6800 GT or greater; ATI Radeon 9800 Pro (Radeon X800 Pro for Vista) or greater. Laptop versions of these chipsets may work but are not supported. Integrated chipsets are not supported. Updates to your video and sound card drivers may be required.
All at ign.com
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Also they have a comparison of low, medium, high and very high screens.
Well When I use my step-up program I should be able to run it at high and hopefully very high.