Hi everyone.. can anyone provide me your suggestions on my new Rig?

Budget: 4.5K+- including IPS monitor
Monitor: Prefer >24" (need help)
Monitor in mind = LG29WK600 29" and Acer ED273A 27" and ACER ED322Q 31.5" LED CURVE MONITOR
CPU: Any, as long as reliable, no problem. (Looking at Ryzen 5 2600X)
SSD: Yes
HDD: 1TB
RAM: Not Sure which to choose
RGB: Yes if its suit my budget, otherwise no.

Program:
Adobe Lightroom, Premiere Pro, CS6
Sony Vegas
Solidworks
Cura
Dota
PUBG
BlackSquad

Thank you very much on the suggestion above. Will go for it.

May I know is 75Hertz Monitor ( LG29WK600 ) is sufficient for gaming? PUBG, FPS Game? I really love the ultra wide screen, but if this UW screen is bad for FPS gaming, maybe the only way I can is downgrade to Dell 24" 144Hertz IPS.

Would like to hear from you all again, thank you