This is a list of the top 5 144Hz 1440p gaming monitors currently available. As of right now, the highest resolution you can get a 144Hz monitor in is 2560×1440.
In the coming months we will likely be introduced to the first 4K 144Hz gaming monitor. However, for now, these are the best options currently available.
While these monitors are all fairly pricey, they represent the gold standard for competitive gamers who are looking for the smoothest gameplay possible.

Infographic by best 144hz monitor