money pits of various forms
Stoich is not something you need to worry about on a diesel. If it feels good to you I would leave as is.
Front end alignmentOkay smartass, you forgot (in no particular order) EGR operation (removal), throttle linkage travel, throttle linkage adjustment, fuel pressure (lift pump, check valves and relief valve), injector spray quality (and pop pressure), CCV restriction, manifold leaks (including turbo to intake o-ring seals), fuel tank vent, fuel tank strainer, fan clutch operation, engine temperature (and replacing the sensor if over 10 years old), oil cooler thermostat operation (if oil cooler gets hot), front end alignment, brake drag, vacuum system operation, transmission adjustment, all 3 drivetrain mounts, exhaust system restriction (collapsed muffler/resonator), alternator charging voltage, A/C compressor and clutch operation, tire pressure, differential free play (pinion slack) and THEN adjust the ALDA because you've covered everything thats more likely to cause performance issues.
Did I forget anything?
EDIT: Damn, forgot "check the ball joints".
EDIT 2: jeanmarc109 added the overboost solenoid on the firewall.