The h115i platinum has a 5 year warranty and hits 92c on a 5ghz 9900k at 1.31v in an hour long Blender test with all turbo limits disabled in a pretty restrictive case as far as airflow (corsair 275R). The only big tower cooler I've seen tested in this same fashion on the Chip hit's 100c (Corsair 570X).
if you have a better cooling option for a 9900k for less money you should recommend it as it would be more constructive to this thread.
The OP is waiting for Zen 2 to make a decision so you have plenty of time.
