With a stock truck there is no reason to spend the extra dime on an aftermarket radiator... How often to you hear of a toyota pickup overheating when the truck is in proper working order? Never. It's not a freaking V8 guys... it's a 100 horsepower 4 banger. I've got some work done in my fresh motor with original 27 year old radiator... That truck gets raped on a fairly regular basis and the temp gauge never moves. Another vote for getting stock replacement. 
'cept its a 150(?) hp v6
Add another vote for a stocker
I would also say to check around for a used on in good shape. They do just fine to cool off the truck
Just don't skimp on the thermostat though, make sure you test it before putting it in there, and get a toyota one!
