Do it son.. MT is the way to go.
I used to have a 06 330i in a manual and that manual made me love the car even more. 335i manual... Even better, but you get the point. Plus since manuals are a dying breed, the resale value is usually higher.
It's up to what you think it comes down to, but IMO the pros of a manual outweigh the very few cons!
Either way, 330i is a great car and you'll enjoy it MT or AT. (but more-so MT) lol