That really depends... if you're doing SoloI, road race, or rally, even a mildly modified vehicle could benefit from a nice all aluminum radiator. It all depends on how hard you drive and for how long.

 

A fluidyne might be overkill, but look at this way, you'll probably never need to worry about it again. The Del Sol radiator will definately be an upgrade from the stock single core but it's not that much larger and still has plastic endtanks. That was the logic I followed when I bought my fluidyne.