Ultra Short Answer: BMW M3
Slihgtly Less Short Answer: Mustang or BMW M3, depending on your budget(BMW is more) and how many rednecks are around(they'd hassle you less in the Mustang)
Also, I'll make it easy and strongly recommend you don't consider anything else. Read on for more... lots more...
You're 14, you can afford to get a car you consider great, and you know the risks/pitfalls/etc/etc.
First of all, I don't recommend getting 2 cars. It's a pain. I am 32 with plenty of cash, and I only have one. You're very lucky to have $1200+/mo income at 14, and extra lucky to have parents willing to buy you this so you can save for college. So...
Let's see your options:
1999 pontiac trans-am with a ws6 package, t tops,
99 camaro SS t tops/conv,
2000 pontiac GTO
1999 audi TT
1998 buick century limited
1999 buick lesabre? idk spelling
1999 chevy S10
2001 chevy windowless
1999 BMW M3
First of all, you probably want something from after 2000. Otherwise, maintenance and repairs can be a real pain.
Let's narrow it down to:
Cobalt, Mustang, GTO, BMW M3. These are the best of the bunch. You know, as cars for a driver who isn't a boring old person.
Pick-up trucks are surprisingly UNSAFE due to being unwieldly and having blindspots. More importantly, they are boring and a pain. Vans are just pick-up trucks with caps, effectively.
Cobalt is the safest bet, but also the most boring car.
The GTO is the next safest, but also the next most boring. It has gobs of horsepower. If you want handling, however, stay away.
Now things get interesting: a Mustang or a BMW M3. That is a very tough call.
I could say... the Mustang is more car for the money, but less car than the BMW M3, which is a lot more money, but less car for the money, but the better car. But that doesn't help you out much, does it? You want someone to just pick you a car already.
I will list some attributes, say which car does the best in each, and then you can decide or go with the short answer:
1) Acceleration: Mustang, hands-down
2) Handling: BMW, hands-down
3) Cost: Mustang costs less overall, no comparison
4) Value: Mustang again(somewhat subjective)
5) Space: BMW M3(if it's a sedan)... and maybe even if it's a coupe. Mustangs are smaller, I think.
6) Safety: tie
7) Refinement: BMW
8) image: BMW(unless you live in... umm... shall we say, the heartlands? Midwest? Surrounded by rednecks? LOL)
9) Over-all driving experience: BMW
10) Passenger experience: BMW
11) Gas Mileage: Probably the BMW here too
12) You'll probably want to keep the BMW longer, unless expenses get to you
13) Insurance: tie(but who cares)
Really, I think the best thing you can think of to decide is which car you'd want to drive until you were 30, and whether or not you are getting a car you want to drive at 30. IF everything else is the same, get the BMW if you want to still have it when you're 30, and get the Mustang if you plan on replacing it at or shortly after college graduation.
Since I would never buy a car planning to get rid of it, my ultra-short answer is the BMW M3. By the tiniest hair's width.
And I think my answer is longer than your question.