If you are looking to spend around $300 I would encourage you to think about a 1440p monitor over a 1080p one if your computer can handle it. There are korean monitors sold on ebay that are really great. Basically, they take the screens from Apple or Samsung that are graded at like an A- and put them in their own housing. They are still great screens but don't meet apple's strict standard. So basically you get a screen that has a value closer to $800-$1100 for $250-$400. It's definitely worth looking into.
Below the first link has a list of the best Korean monitors and the best vendors according to Tek Syndicate. The second link is a youtube video about korean monitors you should check out. I would highly recommend you at least...