You have forgotten spare glow plugs, an extra glow plug ignitor, spare main gear, clutch shoes, springs, fuel line, air filter oil. You may also want to consider spare wheel nuts, spare wheel hex pins (these sit behind the hex and stop it rotating) I have snapped a couple before.
Another thing you should consider fitting is a FUEL FILTER. i never run a rig without one, even if it DOES have a sintered filter in the tank, Maybe consider fitting a wing aswell.
ALSO, stock up on parts that you know you might break.
Maybe look at getting RPM arms (Upgrade), good products and deff worth the investment.
ME ? Well, my 2.5 is staying stock till i break something, then it's upgrade time. On the other hand, my 3.3 is going to be be one heck of a show queen rig and is having Ti arms fitted.