I kinda settled on SRAM PC-69 series chains myself. Not too expensive, stronger than Shimano, easy to keep clean, spare powerlink in the patch kit, and removeable for a thorough cleaning too. I've never had one fail, but I've heard others recommend using a new powerlink every third or fourth time you take the chain off for cleaning. I only give the chain a thorough cleaning every 400-500 mountain miles or 800-1000 road miles. My chains generally wear out before I get that far.