My $.02
Here's the cars i've driven on regular basis over the last 4 years:
2003.5 E46 M3 - Spd
2004 B6 S4 - 6 Spd 4.2L V8
2007 335i tuned E90 6 spd
2009 335i tuned+bolt-ons E90 6 spd
2012 Camaro ZL1 - 580hp Supercharged 6 spd
and now 2013 S4 3.0T 6 Spd
Every car on the list has had suspension mods and HP added (except for the ZL1).
For track duty, supercharged and N/A motors are more consistent, but for daily work you can't beat the Turbo. Maybe M/// has figured out a way to make turbo's feel like NA w/ Turbo grunt down low!?
Guess we'll have to wait and see.
For the record, i went to go buy an 2011 E90 M3 and ended up going to new S4 instead - interior is a huge improvement over the E90 and It's my daily driver and i couldn't handle the weak bottom end power delivery of the S65 for daily use. Compared to my 335i's it was a huge step backwards in the engine department for usability (the S65). I loved the car though, just didn't love the engine. A highly built Factory TT N54+M motor is EXACTLY what i wanted. Dream come true for me. Wish it was out this year, i would've bought one. I don't hear people hating on 997 Turbo's, do you guys? Hmmmm.