Congrats on your new M3!
I had the same opportunity you did, deciding between them...even if the RS4 and RS5 were out..I would still have ordered my M3.
Once you are behind the wheel...you will not question your decision again!
Best of luck with your new M3!
"You will get there, but it is up to you and you alone. It is what you are willing to do, and how you are willing to get there. You must be relentless, you must be tireless, you must pursue at all costs, so that you are ready, when the time is right." -Dad