caoyirui Can we just buy the latest Mac Mini and connect it to a ccfl backlight monitor?
yes, but make sure you have the Stillcolor app running with dithering disabled, and the CCFL monitor is actually true 8-bit which can be rare (i own 3 CCFL monitors that are all 6-bit+FRC no matter what device they are connected to, so not every CCFL monitor is good)
btw i prefer using DVI input on the monitor because it will send an RGB EDID by default
(which means you won't also have to go through the Mac "force RGB" steps that you usually have to do with HDMI to get it to not use YCbCr, which sometimes introduces an additional source of dithering)