If you are looking for a PC system that can suit your particular needs, be aware that this is not necessarily a one size fits all type of purchase. A PC system that is suited to a frequent gamer, for example, is likely to be far more expensive and complex than a suitable PC system for a person who simply wants to surf the web would ever need. The trick to finding the right such PC system for your needs is to think about what you want to use your PC for, how much you can afford to spend, and what the minimum system requirements would be in order to accomplish the things you need and want to do with your PC.
Once you have listed the things you want to do with your Pc system, take a look at how much hard drive space and memory you will need to run everything you want to do successfully, and make sure that you have an appropriate graphics card as well, if you wish to perform certain resource intensive activities like gaming. Take a look around the web to see what a new or slightly used PC system that fits these specifications tends to cost on average, and assess how well those prices fit into your budget. Once you find a number of venues that offer a suitable PC system in your price range, make sure you check up on the reputability of each vendor before making a purchase.
Once you receive your PC system of choice, make sure that all functions that you wish to use work as well as you had hoped, and report any dysfunction to the vendor you purchased the system from as soon as possible. If you choose wisely, your PC system should be everything you wanted and more!