I've seen several nice 330i's when looking for mine- Most dealers in my area want around 16k for one with ~80k and private party is usually about 1500-1000k lower.
I think the 330 is a car a lot people bought to be the "biggest and baddest 3" on the road in 2006- then the 335 pops up and everybody goes trading them in for more HP.
Now the latest owners seem to be more conservative drivers who didn't feel the need for the 335.
Theres no guarantee they will be any more reliable than a 335, but it seems like they have been, just looking at the average 3 owners issues.
06 330i 6mt Spt- Eibach Springs, BMW Perf Susp, Supersprint Exhaust, BSW Audio
94 325i 5mt 4d- M3 springs/susp, Z3 wheels, Chipped, Intake, Exhaust= FUN!