I would recommend Dell U2415 IPS $297
For Diablo I don't think 144hz really matters I would take color reproduction and viewing angles over response time and refresh rate.
I know a lot of comments suggest a 1080p monitor, but while this is great for consumers and watching HD videos and maybe games, as a software developer you're going to want more vertical pixels I really recommend you go for a WUXGA (1920x1200) or QHD/WQHD which is basically 1440p. You'll also definitely want an IPS panel.
I'm using one of these for a second monitor:
https://www.amazon.com/Dell-Computer-Ultrasharp-U2415-24-0-Inch/dp/B00NZTKOQI
IMO this monitor is the best value on the market today.
Ja koristim ovaj i vrlo sam zadovoljan. https://www.amazon.com/Dell-Computer-Ultrasharp-U2415-24-0-Inch/dp/B00NZTKOQI