So I have my CPU being cooled with a XSPC RASA 750 kit stock water block( the black acetal one I think). I'm looking to do an upgrade on it as I know it is not the most efficient water block out there. I'm looking at the EK supreme HF blocks. On Dazmode's store site, there are 3 versions: acetal rev 2, acetal-nickel rev 2, the plexi rev 2. What is the difference between these? I assume the acetal nickel is the best out of the three. I want to get the plexi one if there is no considerable compromise due to its plexi structure.