Sportznuts

I realize there is a huge thread on this topic but there is so much information I can't tell exactly what to buy.
What kind of aftermarket Springs are the "best" amongst the many to give me thenough closest to the "lexus" ride? What kind of struts? Anything else to buy while the mechanic has it pulled apart? Looking for a concise part list that will give me 10 more years on a ls430 with minimal suspension problems.