1440p is not 2k. If anything, 1080p is 2k since 2160p is 4k. I haven’t used a 4k monitor for game development so I don’t really have an opinion on the resolution experience.
I’d personally only go for 10-bit color if you’re developing a HDR game, but at that point, I’d also suggest using a good HDR TV instead of a gaming monitor for testing. Support for HDR within Windows and various applications still kinda sucks. HDR doesn’t matter at all for game development outside of shipping an HDR title.
For color accuracy, just get a color calibrating tool and recalibrate your monitor every 6 months. Either IPS monitor should be more than good enough once calibrated.
For refresh rate, if you’re making an FPS, sure go for high refresh if it’s not going to cost you much extra. But for most other games, I’d stick to 60 fps to mimick most players experience. High refresh is nice, but an optional perk.