Unless you have a really good reason, and you know whats inside a PC, don't build one. PCs are so well priced these days that you can get a really well spec'd PC that will last you for years to satisfy all your surfing, document writing and photo needs.
A good reason... well, unless you have special graphics needs like serious gamers, or professional video editing, or some special data processing need you don't have a good reason. You may be able to save perhaps £100 by getting all the components separately but you'll lose all the testing that the big manufacturers put in. Not to mention the difficulties you'll end up with should it not work !



