i read through this thread already many times to find a good bumbper. From someone here i got the tip for this one: URL IS NOT ALLOWED DURING SILLY RULES... blah
(It's the aluminum bumbper in black with two slides and you slide them together so it fits on the S5... google: "Patuoxun® Luxus Aluminium Legierungs Metall Bumper Rahmen Fall Schutz Hülle für Samsung Galaxy S5 SV V i9600 G900F G900H (Schwarz)")
It's an aluminum bumbper. It fits really good and it looks really nice. But in the meantime i've got two problems. The minor one is, that it's sensible for scratches. The major issue - also why i'm searching for another one - it shields the gps antenna and the gps signal is really bad with that bumper. I just wanted to give you a feedback, before someone buys also the same bumbper and runs into the same problem.