Conclusion
The latest price drops are remarkable, especially in the mainstream segment - you can get a hard drive with at least 250 GB for less than $ 130. Even drives with 320 GB are available at about the same cost. Drives with 400 GB and higher are more expensive, which is why we recommend such capacities only if you really need them right away or in the near future. Don't spend more money than you actually have to! If you end up lacking for storage space soon again in the future, you are definitely better off buying another hard drive, because in just one year you might get a 750 GB hard drive at the exact same price you pay for 300 GB today. This constant, dramatic drop in prices makes investing in larger capacities absolutely unattractive.
If you are looking for a system hard drive on which to install Windows, it makes more sense to get the fastest hard drive possible. Hard drives with just a single platter are most interesting, since the performance is best; these include the Western Digital Caviar SE WD1600AAJS and Hitachi DeskStar 7K160 - both 160 GB. If money is not an issue why not even consider getting a Western Digital Raptor?
There is only one thing you should keep in mind: Increasing capacities cause a higher demand for backup storage space as well. We would not recommend saving an MP3 archive of several dozen gigabytes to a hard drive exclusively - remember that if the drive goes bad, your data will be gone for good.
