There is very little thermal difference in major brand quality radiators (copper/brass), fan selection plays a bigger part in temps. Also frontal area has much more effect than thickness, hope this helps...
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Most every company makes radiators, if your getting most of your parts from one company then perhaps use their radiators also it they are quality, pumps and blocks will come and go as time moves on, a radiator is something you pass from build to build, so build quality also is important.