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As a fellow Chevy guy. If you pull a trailer and or sit in a lot of heavy traffic on hot days. Then just buy 2 -16" fans. Mount one on the rear of the radiator and wire it to a thermo switch to auto turn on/off with temp needs. The front of the radiator fan wire it to a manual switch. That way you can use the front if you need the extra cooling. But a single 16" should easily handle your car under most conditions. I've used a single 16 on different vehicles for at least a decade without any drama.
Recently I spent $26 for a new 16" fan, then another $26 for the thermostatic switch on ebay. The fan is a generic brand. But the thermo-switch is a name brand temp adjustable model, as its more important for reliability.
The more expensive fans that I have purchased in the past were not more reliable, or note worthy better at cooling. The only difference that I saw was that they were louder than the cheap ones. Which I believe is a sign of them using more power to run faster. Knock on pc, I've never had an electric fan fail on any vehicle. If you throw power pulleys on while doing the fan, you should gain 2-4mpg collectively. That's my 2 cents.
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