If there are no issues with the motor. A working stock cooling system will be fine. Most motors make there peak HP at a specific temp, so you want it to heat up to a certain point. So being too cool can be an issue as well a too hot.
Bigger radiators have not done much other than allow you to run a little more coolant. I never noticed a big difference when running water wetter, but that is supposed to be mixed with distilled water I believe to be the most effective. I never did that. As mentioned above, that wouldn't give you any protection from freezing.
If you are racing, or riding where you know if you are overheating and you do not want to stop, can't stop to let it cool down. That is when you will want to run a waterless Coolant like Evans. It won't boil out of your system as quickly. Actually I believe it has melted parts before blowing out. That way if your fan stops running, radiator is clogged. This stuff will help you get to the finish line.
Prestone 50/50 works the best all around though. I personally wouldn't bother with the different fan blades or water pump propeller unless you see your temps running too high, or you don't like your fan kicking on and off as much. It would also depend on the ambient temps in the area you live too.
Also, consider what fuel you will be running. If you are gonna be running higher octane race fuel. That will also lower your temps. You might want to run the motor with the 50/50 mix and monitor the temps before you go out wasting money on new radiators, propeller, waterless coolant, and fans..
Good Luck with the new motor.