TNT2bluz
I have already added shrouds to the fans and did notice a 4-5C drop which makes sense with the staggared tube design, a little more air pressure with a restrictive (air) rad had a larger than expected effect.
And Cather
I compared the pump curves of the RD-20 and MD-20RZ(T) and they are very close. I chose the MD pump for electrical simplicity since I'll be using a 120V blower with it anyway.
Thank you both for your comments.
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