Just be glad you didn't get the commodore, I looked at trading my rs4s on one and after the test drive I took my car home. 19/20 litres per 100km, under powered ( have to drop to 3rd to over take, the stag happily pulls in 5th ) the big selling point the dealer had was it had a pull out cover for the boot, I laughed in his face and said yer mines got that too. But I will admit a 6.7 with an exhaust does sound nice.
Back on subject, I'm 6"1 and I have plenty of room, I can even put the seat forward and still drive with adults in the back seat. Honestly the only downside I have found with the stagea is the spare tyre isn't useable. Also since you bought a rs4s just buy some pre au falcon wheels or something in a rwd offset and you won't need spacers.