BC just hit the market and have hit it big time with marketing and dealer incentives, they have some good reports, not sure about longterm testing and quality of parts from those that I have talked too.
KW varients, RSR, TEIN, Nolen, Bilstein, HKS, Cusco have all been tried on the UK cars and have been tested for some time, dont remember seeing many issues..
But most of these probably havnt been used on the track!! You may be worth talking to the likes of Alex, MrLizard etc that stick their cars on the track for their opinions and expetise!