Haven’t built mine yet, but I’ve successfully pumped ethanol as cold as I want to using a Finish Thompson centrifugal, magnetic-drive pump made of polypropylene housing and Viton seals.
As for the Chugger pumps, lots of people I speak to recommend them but I bought two a while ago and could not successfully get either to pump ethanol through a 36 ft, 3/8" coil - even with 2.5 gallons of an overhead priming reservoir. Super weak pump for the price if you ask me.