I've posted in a couple other comments in this thread, but all together:

Dewalt Gyroscopic Screwdriver. Not really necessary if you do one or two laptops a day, but very nice to have when you starting doing 10+ per day.

Metal Spudger Set

Klein Scout Pro 3 Network Tester

I've also gotten plenty of use out of the Klein Tools Electronics Screwdriver and Regular Screwdriver sets.

I'm sure any kind of cat6 cable cutter is fine, but I happen to like this one.

For non-standard tools:

For anything besides a cat5/6 sheath, or to cut zip-ties, I have used these wire strippers for many years - still sharp.

When you just need to chop something in half: Knipex Cutters. I've also found them quite useful for modifying Chromebook cases that aren't meant of the model they've been put on.