I just completed an install of all my ignition bits bar the coil.
You may be interested to know that the £42 set of ignition leads I bought from GSF for my 2.5na 944 turned out to be Beru leads with Porsche part numbers - that's a 50% saving on any other set I've seen. The distributor cap and rotor were also Beru and once again cheaper than anywhere else.
I was amazed that my distributor cap and rotor were in the condition they were in! Terrible. Just look at these pics - can you see the damage to the rotor and inside the dizzy?
The old plugs were also in a bad way - should I be overly concerned that there was a little oil on them?
The rest of the details are on a blog post if you're thinking of doing this yourself. It's easy.