Hi there,
For gaming I would recommend the WD Black drive, which was especially designed and tested for this purpose. It has a 6 Gb/s SATA interface, 64 MB of cache and a 5 years limited warranty.
As for the storage drive unit, you may take a look at the WD Green - it has low power consumption rate and low noise level, as well as Intellipower, which is a fine-tuned balance of spin speed, transfer rate and caching algorithms designed to deliver both significant power savings and solid performance.
You may check these links for more information:
WD Black - *www.wdc.com/en/products/products.aspx?id=760
WD Green - *www.wdc.com/en/products/products.aspx?id=780
Hope this helps.