What monitor for productivity?

Following up on my last post about a gaming monitor I'm trying to decide what I should go for a productivity rig I'm planning on building.

My main two things will be Photoshop which requires accurate color reproduction (at least good SRGB support) and FL Studio for audio production.

Should I go with 2 27" 1440P monitors or one big 4k monitor? I currently own a Asus PB278Q which has 99% SRGB support and it's a PLS panel which has great color rendition. Would just need another one.

I'm also looking at the AHK A399U, a AVHA IPSeque monitor. 39", 4k, 4:4:4 chroma support. Good deal for the $600 asking price. No gaming will be done on this monitor so the 60hz refresh rate doesn't bother me. Any other 4k monitors at the $1000 price point would also would be welcome for suggestion.

Any ideas, guys? Thanks!