I recently built a desktop pc and the specs are
Intel Xeon E3 1230 V3 4C/8T Haswell 3.3Ghz
Asus R9 280X (will upgrade to R9 290 or GTX 770)
16GB RAM
480GB SSD
etc...
The monitor I am currently using on my desktop is a Dell 2007WPF S-IPS that is 20" 1680x1050 and from what I can tell it uses PWM backlight as I see flickering if brightness is less than 100% if I view my monitor on my camera on phone (flickering is gone at 100% brightness).
I watch lots of high quality videos (movies, anime) and also read manga. There is a night and day difference between my TN laptop (although from what I can tell, the TN panel on my laptop is alot better than most TN panel in terms of color reproduction based on what I see from other computer like when i go to best buy) and S-IPS monitor in terms of color reproduction even when viewing directly.

I also prefer to use very low brightness (about 15-25%) as I spend extremely long hours in front of my computer and lower brightness helps my eyes from getting less fatigue and dry.
Matte (anti glare) finish is also a must as I absolutely hate glossy monitors.
my max budget is $400 and I am thinking about getting either a QNIX QX2710 Evolution II or BENQ XL2411Z.
from what I understand, the BENQ XL2411Z is miles better in terms of motion clarity compared to QNIX QX2710 as it is PWM free and has extremely low persistence.
I also heard that the BENQ has better color reproduction than many TN panels out there.
so my question is
How does the BENQ compare to QNIX in terms of color reproduction while viewing directly? if so are there any direct comparison or similar comparison showing each other side by side?
also I do not understand the backlight stuff.
on the BENQ or any lightboost monitor do I have to set the brightness to 100% on the monitor to achieve perfect clarity?
is there a massive difference in terms of motion clarity between the BENQ and QNIX (QNIX is set to 96Hz)?