I'd say my order of preference for a B7 RS4 Saloon is:
Sprint
Daytona
Phantom
Ibis
Avus
Imola (although this one does climb the list sometimes!)
Misano (this one climbs sometimes too!)
Mugello
Strangely (or not) the list is totally different for a cab; and again for an avant [EDIT: (the green above would definitely be on the list - any lighter and no chance though!)]... So, all I need now is about £1,440,000 and I'm laughing!
Having been lucky enough to see all the colours you were considering in the flesh, I have to say (even if it's my own opinion) that you'd probably be just as happy with any of them; I'd say they all look pretty great but just different moods almost. As my list confirms though, I think you've hit the nail on the head!
Happy horizon-smashing!
Regards,
Rob.