If I was you, I would change the whole lot. Not knowing how old some of the things are could lead to some nasty surprises. Peace of mind also.

I would look into replacing a few things (also mentioned above) such as

Timing belt, water pump and cam seals if they weren't changed at the 100,000km major service.

Other things you could look into replacing if faulty or worn out could be

*spark plugs
*spark leads
*check and clean/replace rotors and caps
*thermostat if your car isn't heating up or cooling down as it should be
*gearbox oil
*brake fluid (even if your one isn't dirty)