Suplex may come under the same reliability umbrella as Spidan (in terms of UK availability) - a few unexpected fractures of springs at low mileage have been reported in the past couple of years (we were one).I would stick with known branded brake parts and have ATE fitted at the moment. Brembo and Pagid are okay too.
I will let others comment on the type of springs but perhaps stay clear of Spidan as there have been some bad reviews of late.
I am looking for some new brake pads for my Audi A2 1.4TDI