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There are a bunch of reasons, but mostly because from what I have been reading up about them and talking to people who have them, they are exactly what I need.
I also like suspension components that are built by a true company that manufactures the suspension parts and not some company who paints some generic coils a different color and slaps their sticker on them.
Support after the sale, reputation, don't need to go that low but want them to perform well, if I drop over a thousand dollars on any parts, I should be able to reach customer service / tech support that same day, not wait a few weeks for an email from Japan... I could go on and on...
Tein CS's aren't too bad either..Didn't H&R make a set for the GS as well? ...
There's HKS but only available via direct as its special order through Japan.
BTW, those Bilstein PSS coilovers are available through Worldpac, so any automotive shop with a Worldpac account should be able to order those for you.