There are a couple of specialty screwdrivers that we use a lot. The first is one that can remove small screws that are difficult to remove or in hard places to get at.
This very handy, good quality Lisle ratcheting palm driver costs $15.95
A good set of openends and box combination wrenches are always in use, I'd recommend that you don't purchase the "best" yet get a set between $50 and $80. You'll need both metric and fractional wrenches and sockets.
An excellent hammer and dolly set is the Dagger Kit below, it sells for $139.95
Hammer and Dolly Link
One of the busiest tools in our shop is the little CP air grinder with Norton Grinding Disks on it. This tool costs $49.95.
I could go on with air sanders, file boards, blow guns, metal cutting tools, stud welders, porta power kits, other hand tools.... the list goes on forever.