I was amazed when I test drove them both. The 325i had plenty of power, the 330i had more. With a MT the 325i tears it up quite nicely. They're essentially the same car, but with a 50hp (or 60hp w/PP), $6400 difference in price when comparibly equipped (CW, HK, Prem and Spt, or PP). Just a matter of personal preference if its worth it. I have no regrets about my 325i. Now if only I had another $20K for a M3...