I like XSPC with pump/resevoir combined for ease.  They run about 70 USD and have a much higher rate than the 450 syscooling pump.  Larger resevoir so more liquid needed, but in terms of being able to properly work it runs great.  My pump was defective and after realizing how long a RMA was going to take with sys I just decided to replace it myself.  Sys wanted several videos of my physically moving the parts of the pump even after I'd cleaned it out and sent two (or three?) prior videos.  Mine run a bit warmer than 35 C, but the miner runs smooth and i've had no problems.  The fittings and tubing and radiator work just fine.  I'm not sure if having a higher pump runs liquid through the radiator too fast and thus the higher temps.  I point a fan on the radiator and that seems to help.  I'm at the max of my power capabilities and the last order from bitmain is probably too much, but I'd already made the purchase.