Fiberglass / epoxy or Fiberglass / any-ester resin will not conduct electricity. It's really only carbon filaments that you need to worry about conductivity with in composites (unless you are using some aluminum coated glass fibers...but I digress).

Fiberglass would be a lot easier to work with than kevlar (not to mention cheaper). If you want to get the good structural / stronger fiberglass, go with s-type.