Hi Baz,
the only major bits I can see that will make a difference is
4056A014 = stablizer links = $84.45 each in the warehouse
MB573054 = Dlink bushes = $11.50 each ex japan
MB518220 = rear castor (lwer control arm) = $39.90 each ex japan
I would probly go for koni shocks and pedders springs, it would be a firm but smooth ride
Travis