Surprised no one mentioned a good sawzall and assortment of blades for it.
That and a nice lil 10# sledge.
Flare wrenches are nice if you are working on brake lines etc, and if you want to do any thing sort of correctly, a good torque wrench is a nice investment.
Biggest thing I would love to get is a plasma cutter and welder. Gotta wait till I move out so I can wire in a 220 line
