Fast, Ultrawide, and Cheap are three words I've never used to describe a 21:9 monitor before - but in this case, the description is accurate. Viotek's GNV30CBXA provides a great value in a highly niche market, and is substantially improved versus it's predecessor with faster refresh rates, better response times, and a vastly better stand.
Sceptre has announced 6 upcoming high refresh rate monitors at a variety of resolutions - 1920x1080, 2560x1440, and 3440x1440 - and at speeds of between 165-240hz.