Which xbox do you have? Like is it the first gen xbox one,xbox one s, or the X?
But for the most part if you are only planning on running your xbox on the monitor without a gaming pc that could push 144fps in games you probably don't need a high hz panel.
You are gonna want something that's like 1080p with an ips panel, not over 25' and a 1ms delay. I'm just assuming that since you are looking for a monitor instead of a tv for your xbox, you probably play fast paced online games. A good monitor would be
https://www.amazon.ca/Acer-VG240Y-b...s+1ms+monitor&qid=1552127143&s=gateway&sr=8-4 It's slightly over budget by about $20 Canadian atm but it's about as good as it gets for console gaming at 1080p 60fps.