Try and find the telltale green trail...coolant will leave a green mark usually. I agree that you don't want to go replacing your radiator if it was in fact your fan clutch, or water pump and it was just collecting there. Look at the bottom of the lower hose too.
If you do end up replacing the radiator I'd go with another OEM. There are lots of threads on which is the best radiator but remember, how long did the original last?
2000 XJ Cherokee
1964 Ford Fairlane 500