stock rear control arms

For a daily driver/cruiser 64 Malibu, would you recommend upgrading the rear control arms or just retain the original ones and replace the bushings? Is it worth upgrading to some aftermarket parts from UMI, Wolfecraft, Hotchkis, ect? The debate over poly vs. rubber bushings has me quite confused and is probably swaying me to just staying with my stock arms. What about using aftermarket arms with all rubber bushings or is that just a waste? thanks.