ransom wrote:
some say they can even be made to change direction.
They can, it just takes some doin's to get there 
As a Mustang-guy, I will say that for your budget, the Camaro will almost certainly be a better handler out of the box. I'm sure the Camaro's stock torque arm setup has its weaknesses, but the fox-chassis 4-link is truly horrid
If you do go Mustang, at the very least you'll need three things right off the bat: CC plates (Maximum Motorsports makes the best), full-length weld-in sub-frame connectors (MM or Steeda), and some better form of lateral axle location (either speherically-bushed UCAs or a panhard bar).
Unless you're chasing ultimate lightness, the SN95 chassis comes with a lot of inherent upgrades over the foxbody: off the top of my head, you get stock 5-lug, 4-wheel disc brakes, better front geometry, and a stiffer chassis. You'll still need the three things previously mentioned, though.
--There is no turd more polished than the Ford Mustang--