Tru Cool with bypass or not?

[zts gixx]

I live in kansas and temps in the winter can get cold, I will drive the truck when it's under 30 degrees for sure. Should I get a 40k tru cool with the bypass or just stick with one that does not have the bypass? I will eventually have a cam, higher stall, headers ect...... Is a 40k cooler over doing it?

Edit: 04 RCSB