Hey guys, looking to upgrade bikes soon. I believe I'm going to stay with the Specialized line, probably either the Rockhopper disc, Stumpjumper disc, or the bottom one or two Enduros. The problem is that the local bike shop doesn't have all these bikes in. My biggest hangup is which disc brake to get. My only requirements for a bike is that it be somewhat light but not to the extreme, that it have plenty of full suspension travel, and that it has powerful disc brakes, at least more powerful than my current V-brakes. I don't know the difference between the 525 and 555 brakes, and don't know if it's worth the extra cash. Any advice?