Nope, everyone I have seen go that route have regretted it. The plastic flexes better than aluminum. Only good thing about the aluminum is you can theoretically repair it when it breaks. It has to do with the actual design of the JK moreso than the radiators. Too much frame flex on them.
As far as aluminum goes though, if you're deadset on it I heard the CSR ones are the best but they're like $600 a pop. My junkyard Mopar was $50.
