http://www.tomshardware.com/forum/31/build.html
this would be the best part of the forum to post in, not in perepherals.
bioshock infinite requirements
Minimum Specs
OS: Windows Vista Service Pack 2 32-bit
Processor: Intel Core 2 DUO 2.4 GHz / AMD Athlon X2 2.7 GHZ
RAM: 2 GB
Hard Drive: 20 GB free
Video Card: DirectX10 Compatible ATI Radeon 3870 / NVIDIA 8800 GT / Intel HD 3000 Integrated Graphics
Video Card Memory: 512 MB
Sound Card: DirectX Compatible
Recommended Specs
OS: Windows 7 Service Pack 1 64-bit
Processor: Quad Core Processor
RAM: 4 GB
Hard Drive: 30 GB free
Video Card: DirectX11 Compatible, ATI Radeon 6950 / NVIDIA GeForce GTX 560
Video Card Memory: 1024 MB
Sound Card: DirectX Compatible
you can easily do this on $1500
here are requirements for metro 2033 which is one of the most demanding games currently
Minimal system requirements: Metro 2033
- Dual-Core CPU (Core 2 Duo or better)
- DirectX 9, Shader Model 3 graphics card (Geforce 8800, Geforce GT220)
- 1 GiB RAM
Recommended system requirements: Metro 2033
- Quad-Core or 3.0+ GHz Dual-Core CPU
- DirectX 10 graphics card (Geforce GTX 260)
- 2 GiB RAM
Optimal system requirements: Metro 2033
- Core i7 CPU
- Nvidia DirectX 11 graphics card (Geforce GTX 480 and Geforce GTX 470)
- As much RAM as possible (8 GiB+)
- Fast HDD or SSD
3D Vision requirements: Metro 2033
- Nvidia Geforce GTX 275 and 120 Hertz display
- Nvidia 3D Vision
- Microsoft Windows Vista or Windows 7
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long story short?
i would recommend...
either an i5 or i7 processor
8gb name brand ram. prefer mushkin, corsair
name brand motherboard with sata6, usb3, onboard sound preferably an enthusiast board.
120-256gb boot drive (or 512 main drive no sub drive if you prefer) prefer samsung or intel.
500gb-1tb storage drive (see above) prefer wd caviar black, samsung spinpoint f3, seagate barracuda
nvidia gtx470/gtx480 or amd equivalent. prefer evga
name brand psu for the wattage range (650-850) prefer pcp&c or corsair.
any decent case with good airflow. haf, antec 900, etcetera.
if you want to game at high fps on brand new games such as metro you may have to sli or crossfire.