deciding to do a full service soon (90k), have i missed anything?

Filters:

• Oil
• Air (replace if necessary)
• Fuel (replace if necessary)

Fluids:

• 3.8L Oil and Flush/Friction Reducer
• 6.0L Coolant (1:4 coolant:water)
• Washer Fluid (water)
• Brakes and Clutch (brake fluid dot3/4)
• Power-Steering (if not on max.)
• Battery (de-ionised water)
• Gearbox Oil (check, replace if necessary)
• Injector Cleaner

Ignition:

• Check and Adjust Spark Plugs (replace if necessary)
• Check Leads, Distributor and Rotor Arm (replace if necessary)

Body and Under Body:

• Grease Fuel/Brake Lines
• Check Joints, Steering and Front Suspension (driveshaft, wishbone, balljoints)
• Grease Hinges

Brakes:

• Check Discs
• Check Pads
• Check Shoes / Adjust Handbrake
• Check Brake Line Condition and Master Cylinder

Other:

• Check Tyre Depth, Balancing and Tracking
• Check Headlight Alignment
• Check Wheel Bearings
• Check Wiper-Blades
• Check and Adjust Drive Belts (replace if necessary)
• Check all Lights and Bulbs
• Check and Adjust Idle Timing / Clean TB
• Check And Adjust Tappets (audible inspection)

http://www.club323f.com/ba/tuning/servi ... vicing.php

If you're replacing the air filter, consider putting in a high flow washable jobbie (e.g. K&N, Piper etc. ). It may cost more now, but you won't have to replace it ever again, and it will improve performance a bit ...