Join Date: Oct 2004
Location: DC / Maryland suburbs
Bikes: Homebuilt tourer/commuter, modified-beyond-recognition 1990 Trek 1100, reasonably stock 2002-ish Gary Fisher Hoo Koo E Koo
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Your cranks take an ISIS bottom bracket. ISIS is a *standardized* type of splined BB spindle, so any brand of ISIS BB will work, but it must be English threaded, 68 mm wide, and you should get the length as close as possible to the current 108 mm (in general going 1-2 mm too long is safer than going 1-2 mm too short).
Shimano's splined Octalink BBs are *not* the same as ISIS.
Nashbar has ISIS BBs cheap, about $20. I've heard good things about them, though not used 'em myself.