Looking for advice on a new monitor purchase

[studiothree]

Hey guys, long time no post.

I've got a rough specs list I am looking for in a monitor and I was hoping for some help.

I currently have a generic 1080p 27" 60Hz Samsung monitor but I am looking to upgrade to a monitor with the following specs:

• 120Hz or more
• 1440p
  
• 1ms response time
• G-Sync
• 27"

I have around £350-£400 to spend, but obviously would prefer to stay on the lower end of that budget.

any recommendations welcome - thanks a lot!