I wanted an RS6 SOOOO bad! I had a twin turbo Stg 2 S4. I met a gentleman at Sebring who said he just sold his RS6 and got a 335i. I screamed "Heresy", but; For all intents and purposes, just as fast, he said. Better car overall, less cost and BS.
I now own a 335i coupe. The RS6 cannot be after market warrantied and is blisteringly expensive to service. Is it a great car? F*** yeah!
The OP has a 330? try the 335i...