There are three main types of systems that you can choose from the personal computer, the gaming computer, and a business computer.
A Personal computer is described as "a small computer designed for use by one person at home." Personal computers can range in size in memory and hard drive space. If you will be doing basic computing such as word processing, or simple internet browsing then a personal computer will be right for you.
A gaming computer is a personal computer constructed specifically to process enormous amounts of data required when playing massive multiplayer online role-playing games (MMORPGs) and online first-person shooter games. "World of Warcraft" and "Counter-Strike" are popular, long-running examples of both of these types of games. So if you plan on using your computer mainly for gaming then this is the right p.c for you.
Although building a business computer is not something that I would recommend, if you will be working from home and doing any of the following then it may be something to consider. Data compilation, graph design, slide presentations, document preparation, maintaining customer addresses, preparation of invoices and billing, inventory control, email and other correspondence, and storage of all of the above.