GPU advice please

[Cecil.oeilvert]

Hi desperate need of a upgrade currently using a gtx 770 so showing It's age looking to spend about £200 maybe go a little over if it's worth it.

Currently running
Ryzen 7 2700x
MSI Mortar Max
Patriot Viper 4 Blackout Series DDR4 16GB
WD SN750 1TB m.2

I know you probably get asked these questions most days but any help would be greatly appreciated.

 

[Cecil.oeilvert]

Well I was planning on purchasing a 1440p monitor but I'm think my original budget for the graphics card might be a little low, if I was to go for the 1440p route what sort of card should I be looking at? Thanks

 

[Cecil.oeilvert]

Budget wise there's no set in stone amount so can go up to £300 with out much problem.
My current psu is Corsair RM750x would this be fine for those GPU or would this also need upgrading.