Those are nice specs. And the monitor could be best choice for the money for gaming. Though maybe read up on photoshop and curved monitors. Some tend to prefer non-curved for such work. And some prefer VA (great blacks and contrast) and some IPS (better viewing angles and colour consistency) type panels.
If in doubt, and definitely wanting to favour Photoshop work over gaming, something like a 24" 1440p IPS like an Asus VX24AH might be a pretty safe choice. You can find those for £189.
24" is often found to be a bit small for 1440p in some ways (reading text mostly) but with higher PPI (pixels per inch) it can be of benefit to photo editing (122 PPI on 24" 1440p v 109 PPI on 27" 1440p).
There's also a Viewsonic VA2719-2K-SMHD (27" 1440p IPS) available for £199.
And a Dell P2418D (24" 1440p IPS) for £216. You pay more for Dell but they tend to have among the best quality (as far as monitors go) and the best customer service.
1660Ti should handle 1440p 60Hz gaming, as well.