Originally Posted by
Slaninar
Also SRAM 70 series (PC-870, PC-970, PC-1070 and so on). 50 series are not that good, and more expensive series are just better looking, not longer lasting.
You're off by one series there. At least in the 8-speed domain, the PC-830 wears quickly, but the 850 and up enjoy a good long lifespan, the only differences being cosmetic.