Any thick RAD will be ok there's not much difference between top brands, it depends more on the temp of the air and how much is being blown through them.
Being very generic the thinner/less dense fin the RAD the faster the fan has to run to achieve the same temperature dissipation, i have used black ice, feser and thermochill..and have currently got an EK (because it was cheap), so basically what ever thick RAD you can get at the cheapest price point.
Its similar with CPU blocks unless temperature is a problem and every degree counts the figures are within a couple of degrees for all the top brands, in fact that goes for more or less all cooling kit (TIM, water/additives etc) i suppose if you go cheap across everything you might be 5-10C worse off, but you could save half the cost.
