I tried getting my mom to let me borrow her 02 5 series for my prom...and she said no.
So, I drove my teg.
Look at it this way: If you don't get the M3, and pops gets the Jag, you still have a Jag to take to the prom...which beats your Accord. Which brings up, you've got a 15k car that you are taking for granted.
I'm not trying to flame you at all, just trying to help you realize that you've got it well off right now.