This should get you started.
By the way, my personal preference would be a manual 325 over an automatic 330, and a manual 330 over either of them.
I don't know about convertibles, but a manual 330 sedan (5 speed) hit 0-60 in about 6 seconds as tested by Car & Driver when new, and a manual 325 hit 0-60 in 7 flat (also from Car & Driver).
2004 330i, 6-speed, ZSP, Silver/Black
2012 Mini Cooper automatic (wife's daily driver, snow machine with Blizzaks)
Last edited by Shrike; 07-27-2010 at 01:57 PM.