here we go
robin
As for comfort i agree, if you have fully adjustable suspension you can have it set up more for comfort, but then if he wants to go on track, he'll be wanting to change it, otherwise why have them, So its either pay for it to be done, or have a go himself. chassis and damper tuning is a real art and not something the average guy could/should do.
Coilovers would be a waste of money on a car that is doing the amount of motorway miles he does.
On your car it makes sense, you do quite a lot of track days and drive very enthusiastically an enjoy putting only the top kit on your car .
this is of course just my opinion and your car is also the best in the whole wide world. I'm just giving a more cost effective and realistic option for him, however if the OP wants the best then as previously stated, get the bilstein PSS10s