I bought MB blue from *****geek.com and it ran me about $25 per carton shipped...I have heard others say the zerex is just as good. I was so paranoid after doing the head job on my 87 that I just went with MB blue coolant. At least on my 87 there is a warning sticker saying not to use regular antifreeze, so I am very wary of green coolant in this. I think you will be happy with the Nissens radiator. The one in my 87 was put in about 8 years ago according to receipts (before I owned it), and I have had absolutely no issues with it. Best of luck!

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97 S500 (90,000 miles) - wife's car
87 300D (298,000 miles and a replacement #14 head)
94 Suburban K2500 - need something to haul firewood
83 300SD (343,000 miles) (sold)