The N54/55 in the 35i cars runs out of air at 5k rpms and the diesel drops off just before that.
Depending on options 335i probably best bang for buck but beware of used cars since many have had aftermarket tunes installed which accelerate wear on engine and drivetrain. Same probably goes for used 135i. The 135i has same engine and drivetrain as 335/535i except with a shorter wheelbase
Consequently it's not significantly lighter than the 335i. Shorter wheelbase makes it "tossable" and more jumpy on poor roads. It's a trade off. For a daily driver with some spirited runs now and again the 335d tops out. The mantra that people buy HP but drive TQ holds true with the 335d.
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Last edited by BMWTurboDzl; 11-16-2012 at 07:01 AM.