i CAN'T speak to those components, haven't heard of that company, but $18.00 for a cpu waterblock sure seems too cheap
one suggestion, whatever radiator you choose, before ordering make sure it will fit in the spot where you want to put it in your computer, I only caught quite by accident that the radiator i was about to order was 153MM in width (across the two long edges) and my computer case would only accept 147mm
ie just noticed i assumed you were using a Corsair case because you mentioned their fans, but for example, just because the case mfgr sez the case will accept a 280mm radiator, not all 280mm radiators are the same actual physical size, length can vary from 297mm to 320mm with the metal chassis or frame surrounding the radiator, and width can vary from 144mm to 153 (or more), and then there's thickness - notice in the picture below, with the radiator w/fans mounted at the top of the case, the top 1/2" (13mm) or so of the ram is covered. To change ram sticks, the user is going to have to remove fans, or in the case of that computer case (which is the very one i have) there are 4 screws that he removes and lifts radiator w/fans attached up out of the way
Corsair should have the acceptable dimensions in your User's manual or on their website
fwiw