Yes, in my opinion the M3 is worth every penny. That being said, and as Rocky stated - if you are already having doubts about wanting to keep up on the maintenance of the M3 and disappointed in the cost of said maintenance or upgrading parts - I would second his statement and say keep your sedan and avoid the M3.
The M3 is phenomenal, rewarding and an 'experience' to own - wrapped up in part of that experience is $, joy, nerves, exhilaration and some other emotions.
Sounds like you need to take one for a test drive and then have a real heart-to-heart with yourself about the entire M3 ownership 'experience.'
With zero disrespect to your current 328 - there is NO comparison between the two other than the fact of the BMW emblem being on both cars.
"! First rule of Italian driving, that which is in your mirror is not important !"
Last edited by scca_ziptie; 11-12-2012 at 02:50 PM.