A few months ago I was throwing around the idea of trading in my 335i for an E90 M3 sedan with the DCT 7 speed. Test drove it and it was a real screamer in the top end, felt slower than my 335i around town but thats expected, (heavier car with less torque) but it made up for it in the upper revs. After working the numbers (almost $70,000 OTD) with the options I wanted, I figured I should just keep my 335i and find myself a 2nd super fun car. Thats what I did.
The driving experience in the 370Z reminds me a lot of the E90 M3 I test drove, moderate torque down low and the car has a sweet smooth acceleration feel to redline. Did you notice steering feel between the 370Z and the E90/92 M3 feels almost the same? The 335i's steering is much heavier, but the 370Z and M3's have a lighter much livelier feel.
My 335i has been pretty reliable for the most part, 35k miles so far. 2 high pressure fuel pumps, 1 failed driver side mirror motor, and 1 set of rear brake pads.