Cooling upgrade suggestions

[Nickanator8]

Hey guys, I recently took my car to Rocky Mountain National Park and for the first time ever I saw my engine temp gage start to creep higher and higher. I was driving up a mountain road at a constant 30 mph on a very hot day (about 90f).

I feel like this is something the boxster should be able to handle, so it's annoying that it couldn't.

I've already got a new water pump and low temp thermostat waiting to be installed, and I have a stock center radiator because I bought an S, but since I'll be draining the coolant and want to make my car as reliable as possible I'm curious if there are any other reliability mods I can do while I'm in there.

I've already cleared the radiators of debris earlier this year and I added some wire mesh to the bumper cover to prevent new debris from getting into the radiators, but I'm considering upgrading to a thicker unit. Any suggestions on known, reliable brands I should consider?