For those who choose air-cooling, our highest recommendation would be the new Noctua NH-D15 G2. This CPU cooler seems to be tailor-made for the Ghost R1, and while it's incredible to cram such a large CPU cooler in an SFF case, it will keep the most demanding CPUs as cool as a winter breeze. For those of you opting for liquid-cooling, our top recommendation goes to the ARCTIC Liquid Freezer III 280 AIO, or if you want to set up a full custom loop, then a chonker up to 60mm thick 280 (side-mounted) rad, such as the Hardware Labs Black Ice Nemesis 280GTX, will best cool both CPU and GPU on a single rad.