I would agree with everyone that says you should wait on getting a new M. It seems foolish to spend such a large amount of money on a new car. Especially when you have 10k in savings.
I'm 17 and I already have 2k in savings, I've only been working 1 year. I only made $6500 last year, but I was able to pay off my $3k Civic, pay for the gas, and pay for the insurance.
If you really want it, why don't you save up for it? That way you don't spend months paying off just the interest. Plunking down 60k at once for a car would seem like a lot more money. 60 months is quite awhile to pay off a car too. By then there will probably be something bigger and better out, that you will want instead, and you will go through the same process again. All the while gaining even more debt. Start budgeting your money and find a way to put as much as you can afford into a savings account every month. It's nice to have that buffer just in case, and in a few years you'll have a nice hefty sum saved up. $10k is really a measly sum for someone that makes enough to spend $1000 a month on a new car, you should have at least 6 months pay in savings.
Personally, I think that living your life in debt (aside from a house payment) seems like it would get old fast. I don't want to owe everything I make to someone forever.
First I'll address Chaz. You're 17, you seem pretty level headed and that will pay off in the future. However, in no way can you compare your situation to that of someone who has to pay to house and feed themselves on a daily basis. There's a reason why the youth of America has more disposable income and buying power than any other single segment in the US market, lack of expenses. Saving is relatively easy when you can bank virtually all of your income earned. Continue to save and do what you're doing, but understand that in the future the situation becomes much more complex and difficult. Before college I had about $15k saved up of my own money, but things quickly change. In reality, knowing what I know now, I am so behind the ball in comparison to people who grew up with investments in their names and bonds waiting for them when they turned 18/21. I should have been taking my money and rather than letting it sit in a savings account, I should have prepared a better future for myself through investments.
A general rule of thumb for short term savings vehicles, a.k.a. savings accounts, is 2 1/2 months salary in savings. If you were to put away six months worth of salary, into a low interest yielding savings account, you're missing out on the potential money to be made from investing your money. At that point you should be looking at safe investments like money markets and then onto mid/long term investments and then onto long term investments.
I'll weigh in my comments. Its a shaky economy right now that will eventually become stable, but no one is sure of the changes that will take place between the current instability and the eventual stability. In that time you may find yourself out of your current job. There's no real reason to carry that sort of debt especially in a time of instability.
You'll eventually find another girlfriend, so consider that money that you've said you now has left over as already earmarked. Within 60months someone new will be along or you'll have a completely different situation in general.
As an alternative the Lexus IS F or even a BMW 335i optioned seems as though they would be more than sufficient for your needs. How many times do you take the M to the track that you really need the "increased handling capabilities of the new M" when the 335i can probably handle anything you can throw at it, out on public roads.