Hard drives desirable to acquire so that they were all from the same manufacturer. Do you need a sound card. For video editing computer sound card availability is irrelevant. Purchase of additional sound card justified only if you are seriously involved in processing sound. Otherwise, you will be enough capacity built into your motherboard audio. What kind of video card you choose. As practice shows, no real benefit from exposure to expensive graphics card with video editing in DV format not.
Therefore, if you intend to mount only in the format DV, for this component can safely save. Card chosen so that It was certainly not the cheapest, but let's say younger model high line, from a reliable manufacturer that would ensure the stable operation of the system and high-quality video output on your monitor. Situation changes completely, if you want to with DV format and mount another HD. Here is the video card plays a crucial role in the assembly and reproduction of the format to achieve better performance with HD and using various additional modules, it is recommended to use memory card with at least 512 MB. For a budget system, suitable or Radeon HD 3850 512 MB GDDR3 or GeForce 9600 GSO 768 MB. For an optimal system the best choice for today Radeon HD 4850 512 MB. What a drive desirable to have in your computer. To date, virtually all DVD-RW drives have virtually identical characteristics and are inexpensive. Therefore the choice of how you drive a certain brand, it's a matter of personal preference.