I have heard differing opinions about SSL. Seems to relate to the driving style; hard driving sporty cruising etc. Personally I would go for the Tim Ayres Rutherford modified suspension solution.
More info please - I have read about the Rutherford AVO shocks but nothing else
Also if I do the Chrome king pins I assume I'll also need to fit new bushes and ream them out. I don't have reamers so I'd need to buy/borrow one presumably