Silverline SR17.5 crossover modifications?

Does anyone have experience with crossover modifications for the Silverline SR17.5 monitors? I'm considering changing to higher quality parts and would like your input: Dueland resistors, Mundorf silver-in-oil caps, Alpha core inductors, and silver wire. Or should I just leave them alone? I don't want to change the overall sonic character of the speakers, just improve what's already there.