I haven't tried any of the current generation of coaster braked hubs, but SRAM has a great reputation in Europe. I would steer away from any unknown brands, the cheap ones that come on the WM type bikes are deadly.
I have a couple of the old Bendix 2 speed hubs and they are rock solid. The old Sturmey Archer TCS was an accident waiting to happen. I maintain one bike with a Shimano 3SC on it that does the job for the person that rides it. You can get roller brakes to fit the Nexus hubs, just have to make sure you order the correct hub.
Aaron
