It all depends on how much you want to spend. I would recommend IPS or PLS monitors. If you're looking for a 1440p monitor there are cheap Korean IPS monitors on ebay. Heres a link with some 1440p monitor recommendations and links to sellers https://teksyndicate.com/news/2013/0...p-monitor-club. The Dell 2412m and 2312hm are popular IPS monitors if you don't want to go the 1440p route. I don't really know much about Gsync and there are 4K consumer grade monitors available now.