In my humble opinion most (and I say most not all) people will simply want to improve the overall look of the car and slightly improve the ride quality...

Again in my humble opinion most people would prefer to simply fit and forget and not wish to adjust there suspension...
Agreed Coilovers are the ultimate suspension upgrade, but it's for the guys sister and she wants a pretty simple upgrade. A full set up from the likes of Spax, Koni etc who spend millions of pounds on development and produce kits made specifically for the vehicle will be in my opinion be far more than adiquate for her needs.