#1 and #2 Philips head screwdriver
#1 and #2 flathead (short and loooong of each)
Drill Blank based hex drivers (buy a set made for the hobby so you get the sizes you need) Losi, OFNA, Trinity are just a few names to look for
4 way wrench for glow plugs and so on (or just a good nut driver for your glow-plug)
Nuts Drivers (again, go with a hobby set, I use Hobbico so I got all the sizes I needed)
Ball hex wrench for engine mount screws
Needle nose pliars (I bought a hobby set pair because it is made for bending linkages, stripping wire and holing shock shafts)
Turnbuckle wrench (you will appreciate this tool!)
Ballcup wrench (you will REALLY appreciate this tool)
Dental Picks are AWESOME for too many things to list
Assorstment of brushes
Spray bottle (adjustable!!!!)
Files
and last but not least, A Dremel!!!
I probably left something out..........