You know, the more I think about this, the more I like the cheap Amazon alternative.
The Mopar radiator is definitely the best quality part and what I would choose going forward if available. However, if you can't source one, it doesn't really matter how good they are.
The $70 Amazon radiator isn't as bad as some I've read about and actually seems to be more cost effective than the Mopar.
Assuming my 2 previous radiators are true representatives of their brands, the Mopar radiator lasts 14 years and costs $352 (I know you could find them cheaper in the past, but the only one I could find was at a dealership and I had to pay retail). The Amazon radiator lasts 5 years and costs $70. So, for the same $350, you get 14 years of runtime from Mopar, and 25 years of runtime From Amazon.
I wish I would have tracked this more closely by actual mileage each radiator lasted, but I didn't, so all I really have to go by is time.