I found out that my rear suspensions makes a hell lot of clunking noise whenever there are passengers at the back, also the front suspensions makes the same noise as well when going over bumps.
I've read the 4AGE and Trueno/Levin Questions thread about Superstruts and what problems they have. However most of them are a bit too deep for me to understand...my knowledge about cars is only at the noobiest level...

So...Im thinking of replacing the suspensions sometime in the near future, and I need some advise on a few things;
1. At the lowest cost, what kind of suspension should I get to maintain the same performance level of superstruts?
2. Referring to question 1, where can I get them?
3. Do I need to replace them urgently?
Thanks guys~