The "Fox Body" Mustang is the easiest car to get to handle the corners. Of course an 86 5.0L motor is a bit of a dog (original destined for the 86 truck line and used for the Mustang when they ran short of time to develop a better engine for the line in time).

http://www.maximummotorsports.com/

If you have a limited budget start with the basics and in this order.
F&R Coil Springs (not lower than 1.5" below stock)
Adjustable Shocks and struts
Polyurethane suspension bushings
Panhard Bar
Strut Tower Brace
Subframe connectors

Look at MM as their products are well thought out and track tested (myself included). Used to point people to Kenny Brown, but due to family issues, he has sold out and closed shop.

Bill