I buy Park tools as I need them, so I don't have to see the whole cost at once. I really like the Park cable cutters.
Bottom brackets can be very frustrating without the correct tools (which are specific for each type of BB).
What I wish I had on hand would be a nice set of small files, and every polishing accessory available for my Dremel.
Also, depending on the type of headset you would be working on- if you search Youtube there is a video instruction for a homemade headset press, which costs ~$12.00 and works great for older stuff. Disclaimer- I would not use that on anything with carbon.
Beer comes in handy, too.
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Last edited by Jadesfire; 10-14-16 at 10:27 AM.
Reason: Added a few specifics.