I wouldn't say it's cheap crap, I've had hardrace rear camber arms on my Z for well over a year now and they look pretty much like new still, still adjustable and haven't had any issues at all. Bearing in mind you can't get SPL stuff in the UK it's not really a comparison. Oh and before anyone points at vivid racing saying they are in the UK, they aren't they just display prices in GBP and then ship to the UK from the US, so you still have to pay import taxes etc etc.
I also wouldn't say that it's a $30,000 car, it's a £6,000 car, which is very different.
I just purchased some SPL rear camber arms from Clark Motorsport so I hope that you can get them in the UK or I've just been done.
Edit: or is it just another trading name for Eibach?
Thats SPC/Eibach, SPL are a different brand as per the ones posted above