Hex screwdriver set
You probably won't get too far without a set of decent hex drivers. I have used this set for over a year with no issues whatsoever. It's a set of 4 drivers: 1.5/2.0/2.5/3.0mm.
Tools
Aneng AN8008 Multimeter
At 20 bucks it's quite affordable and has continuity mode for easily checking for shorts. Good to have, has been very useful.
