The tools I use most frequently--pretty much every time work on my pins:
Master Mechanic tool set. I've had this for over a decade (prior to my pinball hobby), and it has all the sizes I've needed so far (for pinball), with the exception of a 5/8" socket for legs. However, I'm not quite sure if this set is even made or sold any more since it didn't turn up in a cursory search. It looks like the brand is carried by True Value, which has largely been replaced by Ace Hardware stores in my area.
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Standard needle nose pliers (blue handle), long reach / jewlers / precision needle nose pliers (yellow handle), Cutter (from a 4-piece set), and 6" metric/inch/fractional digital calipers
http://www.amazon.com/Inch-Reach-Needle-Pliers-Jeweler/dp/B005D667N0/
http://www.amazon.com/gp/product/B000J0LJRY
http://www.amazon.com/gp/product/B007SWYRUM
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Weller WES51 analog soldering iron.
http://www.amazon.com/gp/product/B000BRC2XU
Lastly:
18lb tumbler from Harbor Freight. The up-front cost seem like a lot compared to smaller tumblers, but it has been well-worth it, considering the size of the parts I've been able to use in it. If you buy it, I'd suggest driving to a Harbor Freight store, rather than shipping it--I've had issues with large, heavy items breaking en-route from them. Also, make sure to use one of their 20% coupon with any purchase from Harbor Freight.
This list is by no means a complete list, there are several other tools I use regularly and infrequently. These tools are the tools I just seem to always end up having out when working on stuff.
