I see your cheapo is from LMC. I've found that parts from LMC are generally decent but every once in a while you'll get a lemon.
I bought a radiator for a '79 F-100 from LMC and it was copper and brass and made in Thailand. It seemed pretty decent but spring a leak at the header tank after a few years. I had it re-soldered completely around and it's been fine ever since. You shouldn't have to repair a three year old radiator, though.