BOSE - some say it is crap, I find the sound fantastic for a factory fit unit! Def a worthy upgrade unless, as said, you plan your own ICE.
The GT Seats, well in my suit I slip all over like a wet kipper, however on the track or when wearing non suit clothing they dont slip. I just completed a 2500 mile trip, 800 of those miles done in one long day - only stopping once for fuel - I got out as did my missus at the end of the day without a single ache, no arse cramp and no lower back ache. That is the mark of a true comfy GT car.
Def get the GT pack and go fo RAYS, the standard alloys are nice but they are like the Audi TT with the 1 exhaust or the 2 exhausts