I think... in the US, Silvermax is the equivalent of BC Racing, i.e. cheap Taiwanese built suspension that gets turned for "local" conditions.
Back in the day in Australia, you could get MCA street for about $1300 and they were awesome. Don't know about now...
In saying that, my real world TEIN experience: I got some street basis z for my old Liberty (BR9), and they were awesome ($800-odd delivered from demon-tweeks in the UK). so Don't discount TEIN