Getting back on topic.
Having owned both a 325 and a 330, I would definitely go with the 330. I believe it's about an extra 40hp +/- which is definitely noticeable. The brakes are also noticeabley better, it comes standard with leather, and if you get a 6 speed, it is about the same as far as fuel consumption is concerned. Both my cars were manual coupes so I don't know if there's a fuel consumption difference between the automatics.
The only downside to the 330 is that it's a little more expensive to buy, but will get you more when it comes to sell it so I don't really consider that a downfall.