I went with the plastic and aluminum as well after reading towcats recommendation on them. Mines been in about five years now with no issues.7 years on this aluminum/plastic and so far so good.
(I had the original brass/copper but only one shop in Philly area would re-core it and the price was crazy $$$$$$$ expensive with only a one year warranty.
I also have the same in my 81 Corvette for a couple years and so far so good.(a ***** to change)
Scrapped the two brass/copper rads with a small bucket of copper and put over $150 in my pocket.
WOW... price below has gone-up!