I have the B6 S4, I've had it for a year and I absolutely love it. There are a few issues with the RS4 V8, it needs the inlets cleaning as they gum up due to the exhaust recycling system they have for the emissions, but I'd have one in a heartbeat.
Here's Mine .;.....
Mine has a fully rebuilt engine with just over 5k since it's rebuilt and was then fitted with numerous JHMotorsports (US Company) items including a level 2 map, taking into account the decat and milltek system. Sounds absolutely awesome. Also had all the suspension done, and it handles unbelievably.