I was floored at this. $40,000 for a mustang GT super charged to 727 HP at the wheels from a dealer and they will ship it anywhere in continental US!
http://www.lebanonford.com/the-727-hp-mustang.htm
If that's not enough HP per $ then they also just released this one. 1200 HP at the wheels for $50,000!
http://www.lebanonford.com/lfp-hellion.htm
If you're looking for a fun vehicle for your next build, this may be worth looking into.