Best place to get the Bmw perf suspension kit

I am thinking about pulling trigger in Bmw perf suspension kit. My understanding is that this comes with new dampers, Bmw perf yellow perf springs, new front anti sway bar, and hardware for install. I am seeing this kit for 1400 on turner. Is that right? That seems very high.



The alternative is koni yellows wth the perf yellow springs. If I went this route do I need new perches and hardware. I am having trouble on what I need. Who is best to deal with to walk me through.



Thanks