I ride a Pacific Cycles road bike, about 150 miles a week (30+ miles a day, 5 days) in the hills around metro Atlanta. Anyway I destroyed the factory bottom bracket, and the Sunlite SL-26 68mm bottom bracket the local shop put in (It's a Shimano BB-26 clone I think). Ok, so I since bought the tools and put a third cheap bottom bracket in this bike, I expect to also destroy. I'm looking for some tips on what to look for when selecting the inevitable fourth BB. Bearing material? Shaft material? On this journey I've already learned there is a lot I don't know about this component. I can say that I know it's not a competition bike, maybe my best option is to just keep popping cheap BBs on it? Thoughts?

Thanks,
Rob