One tool I strongly recommend getting is a good quality ratcheting click type calibrated torque wrench for proper tightening of crank arm bolts. The crank arm bolts require a torque of about 400 in-lbs (33 ft-lbs) to prevent loosening of the crank arms. This cannot be done using a hex (allen) key, and cannot be done accurately with a ratchet wrench and hex fitting. Futheremore, even when tightened properly, square tape cranks can creep on the spindle and lose bolt preload, requiring periodic retightening when first installed. The only way to check this is with a torque wrench. If you use excessive torque, you may draw the cranks in too much and wear them out prematurely.