I enjoy MTB and road biking very much, but are an athletic 250#. I've read through this forum and the links in the pre-read section, but am unclear on bottom brackets. Seems to me that in non-shock situations, nothing takes more stress than the bb itself. It seems to me that if one thing makes sense to swap out (besides a good wheel build, which my mavic 317s seem fine), the bb is the thing to worry about. Anyone concur? I've heard good things about Chris king, any suggestions or negatives?