Choose the system to cool your PC might seem silly, but it is not and we see why. A way to dissipate heat produced by the components, there must always be to avoid overheating and rupture of the latter, but not always enough to sink the common stock air, since there are several ways to dissipate this heat, now I will list some starting from simplest and most common: Cooler air; Passive heat sink; Watercooling; Liquid nitrogen/ dry ice; Phase Change.
As you can imagine the elements are in order of cost and capacity of heat dissipation. If you do not want to break the world record in overclocking we previously eliminate the last two options that are able to bring your processor well below -200°, but it is not useful to those who want to use their computers in the world of gaming. But now we analyze in detail the steps that must be followed for a budget and get the most of your cooling.
1.) First you need to be clear about the use you will make of your PC (for example, example if you want to play you will not take a passive heat sink), and you can start to choose the right category for you according to this scheme: Passive cooling: for users who use bring your own computer in the office or use it just to browse, then there must be excessive stress cpu. Consider also the possibility of wanting to use the computer for other purposes.
Air cooling: for users who want to use their computers to go a bit over the services of the office, how to play online games on the internet. Air-cooled / liquid: for users who enjoy gaming without being overclocked (if you do not know what, then do not need it), perhaps this is one of the most expensive, but you can save money with a good air cooling with heat pipe.
2.) Once you have chosen according to your needs you need to see how much your CPU gets hot under stress with special programs like OCCT. If your temperature is below 40° then you can also avoid spending a fortune buying the sink that dissipates less watts, otherwise if you are on the 50th to go on quality standards, if they are above the temperatures mentioned, I recommend you do a nice gift to your cpu.
3.) After choosing a category and the amount of heat dissipated in watts you have to go to the brand, currently the best are those that naturally cost more, so be careful not to take the object with lower price on two items that appear identical but different brand.
4.) For the aesthetics instead, it is subjective, for example: for the water cooling is the uv reactive liquid that makes the fluorescent liquid. Do not buy too-large heat sinks that most likely will not come into your homes.