The thermalright assassin is a very well liked and used cooler for many people. Its only $18 everyday of the week and can provide suitable cooling for any modranged or budget build

This is a great AIO if you just want the luxury of water cooling with the elegance of screen if your on a budget friendly price. At just $70 for the RGB 240mm model this is the best price you can get for a product of its category.  

The Thermalright Aqua Elite is a great cooler if you want a cheap but great water cooler. its the screenless version of the cooler next to it so you would have the same performance as the one with the screen but for $25 less. Its a cheap cooler and is very easy to install even coming with a tube of thermal paste.