My money would go on:
FK coilover suspension http://www.gasperformance.co.uk Russ posts on here, should do you a good deal.
Full colour code Any good local bodyshop
Either RS interior or preferably bucket seats and stripped back. Pay your fiver and checkout the forsale section on here, some buckets on at the moment and I know of one RS interior going (£500).
15-16" alloys: Alloys are a personal thing, I wouldn't buy them new though would cost you a fortune, Ktec stock some, depends what you want really.
Viper induction Kit: Gas performance or Ktec
Prospeed exhaust: Prospeed Wales, google them
Subtle tint
Maybe RS bumpers, skirts and rear bumper but RS replicas are getting very common now. Ebay for sale section on here.
RS steering wheel: As above.
I can't think of anything else atm, but that nowhere needs adds up to £8k.
Welcome to ClioSport anyway,
Alex