please dont buy a mustang, or pretty much any muscle car, your gonna regret it. you may think it makes you look tough, but people will only laugh at you when they see you looking like a tool in an old POS mustang. plus mustangs are the most generic "sports cars" ever, every teenage girl wants a fucking mustang cause they will look hawt in their new tool mobile. that or they want a jeep, jeeps and mustangs are every teenage girls dream car.
ive driven a friends 2000 mustang gt and i hated everything about it, it was slow as shit, had the most numb steering feel ever, it was as shitty as it could get in the corners, brakes felt like shit, it had shit for feedback, extremely poor balance, and just overall a shitty car.
dont buy a car based on engine size, anybody who knows anything about sports cars or cars in general agrees that power to weight ratio is everything, buying a car because it has a v8 is extremely dumb. there are 4 cyl cars out there with more power a better power band and in a much lighter car that you can get for the same price. bragging about your v8 is for hicks and anyone who's dumb as shit.
if you drink protein powder every day, jack off to football games, pump iron nonstop so you can kick ass in your xs tapout shirt, then get a mustang, i dont think anything could stop you.
but if you have any desire for a good performing reliable, and good looking car, the mustang is the last thing you should buy.
if i were you id look into old bmw's and mercedes, they make so many older cars that are fucking tanks, handle extremely well, and accelerate just as well as most modern sports cars.
i looked for like 2 minutes and found all these
http://detroit.craigslist.org/cto/1212180036.html
http://detroit.craigslist.org/ctd/1211696894.html
http://detroit.craigslist.org/cto/1210620196.html
http://detroit.craigslist.org/cto/1208734230.html
http://detroit.craigslist.org/cto/1201134074.html
http://detroit.craigslist.org/cto/1182742149.html