Build vs buy, which will make me less poor?

[Nickanator8]

Gentlemen, I've officially joined your cult.

Last night I went and looked at the blue, 2000 Boxster S for the second time. After another test drive and brief negotiation, I signed the paperwork and now am $5,000 poorer, but one Porsche richer.

Now comes the "fun" part. I'm going to operate under the assumption that this car needs every service item done until proven otherwise. I'll post some pics and specific issues soon but right off the bat what are the things that should be at the top of my list to get the car on a solid mechanical baseline?

Obviously an oil change is needed, and transmission fluid is probably worth doing as well, but what else should I make a priority to take care of straight away?

Here is my list so far
Engine oil
Engine oil filter
Brake fluid
Engine air intake filter
Cabin pollen filter
Spark plugs
Drive belt
Fuel filter
Clean throttle body
Automatic transmission fluid
Water pump
Air oil separator
Brake rotors
Brake pads

The car has 160k on the clock, what am I missing?