I was on the same boat man. Except I sold my RS4 for the M5. You are a happy camper so that is all that matters! Enjoy the Panny GTS, its a hell of a car.
Current: Alpine White F10 M5|H&R springs|12mm/10mm spacers|Eisenmann Race
Sold:Imola Yellow RS4-KW V3|MTM 10mm spacers|Hotchkis rear sway bar|APR Stage 1|Milltek Catless|RNS-E|Euro RS4 Flat bottom Steering Wheel