Which Antifreeze to use?

[L DC]

Hi all:
 
I will be replacing the radiator in my '87 VW QSW since the one on the car is about 30-40% clogged and developed a leak upon doing an extended period flush with CLR.
 
At over $273 for a new radiator from the cheapest place (AutohausAZ.com), I want to make sure to use the right combination of coolant and distilled water to prevent clogging as much as possible.
 
So what is your collective advised on the matter?
 
A lis in another forum indicated that the Blue Antifreeze previously sold at VW/Audi dealerships has been discontinued. Does anyone know if this Penstosin (although not cheap)  Blue Antifreeze is similar to the discontinued stuff? 
 
http://tinyurl.com/6acq36x

 
I last used Zerex G05 (pink stuff) and previously used Prestone (found to be crappiest and worst of all antifreeze).
 
Thanks in advance for your value insight.
 
Best Regards,
 
-Louis