Upgrading a Fairly Stock Suspension

I'm having a hard time deciding if Polygraphite is necessary for my '73 Swinger cruiser. Anyone have any feedback, not looking for a decidedly stiff ride but I am used to a more modern feel. Something maybe consisting of the PST super rubber kit & front (1.125) & Rear (.750) swaybars, KYB shocks XHD springs & bolt in sub frame connectors? Thoughts or opinions?