Your mustang looks good but I agree with everyone else here, you could not have spent over $10,000 dollars on that.
Custom paint shops around here charge $3000 for their services. Some shops in Texas and Cali charge upwards of $5000 (Of the ones that I know of, Ryan also knows of one in Texas.) Even then your other mods do not add up to $5-7,000 dollars. Even if you bought those Saleen's new you still wouldnt add up to that much cash.
Now if you are including the cost of the car I could see that
I also would have left the color of the car alone and played with performance parts a little more. Show doesnt make it go ya know?
Anyways, it looks good. Also welcome to the Mustang Forums

Your a n00b so we might be a little hard on you at times ^_^
-Eric-