If it were myself I would avoid using Poly bushes and look for synthetic elastomer bushing as the poly bushes need greasing and have a short life span in a road car. If it was a track car that you were regularly pulling down and servicing than maybe use the poly bushes but for a road car I would look at the synthetic elastomer bushes.
here is a link to whitelines page with some info on them,
http://www.whiteline.com.au/chassis_bushings.php