Best suspension for Boxster S 2001?

[CrazyBoy]

Hi!


I bought a boxster S 2001 this april with 76000km, in good condition in general. Although Montreal streets are very bumpy,my mechanic told me my suspenions need to be replaced next year, I agree as the ride quality is very poor and I hear like knocking metal from the rear. I was wondering thats a good replacement suspensions system you guys can recommend and where I can buy it from on the web?

Thanks in advance,
Samy