I have an asi rad in my 165 and where my temp gauge would always settle about halfway on the gauge, now it barely gets off cold on the highway, stay at about a quarter in the city. No low temp thermostat, no other cooling system mods besides dual 10s and 75% water.
900 dollars for a radiator is ridiculous. That's decent low mileage Garrett turbo range. I bought my Asi on eBay for 150. how much better can you really get for something that is just going to get smashed by bugs, dirt, rocks, and other random road debris.
For 10, 20, even 30 degrees, its just not worth it. That's a house payment, rent, or tons of other goodies.