Where in bajeebas did you get those prices???
I had a 3 core brass/copper HD radiator from Advance Auto in my F350 before i swapped to the diesel radiator. I upgraded to this because the crappy 2 core aluminum/plastic ones kept leaking at the crimps. After replacing two of them in a year i said screw it and went with the brass/copper unit. There is NO plastic on it. It is made in China. There is a nipple on the filler neck which would be part of the pressurized cooling system and not the overflow. The rubber plug split about 3 or 4 months into use. I had no problems with this radiator keeping cool at all. 50/50 mix with distilled water so i wouldn;t have deposits building up and a modified crown victoria electric fan gave me icy cold air at idle. Never ran hot, never had a radiator problem after that. When i dropped the 6.9 in, this kept the ******* cool even towing my little car trailer. Once i tossed the turbo on, turned the fuel up, tossed bigger tires on and started towing heavier the gas 3 core radiator was becoming marginal but it never ran over 215F in the overtemp position.
The 3 core brass cost me 180 from Advance with my Commercial discount.
I just checked cold air distributors and they have a Visteon 3 core for 200.
Advance also has 15% off over 100 bucks.