I would suggest a few basic suspension components for you to get started.
1. Springs - Maybe the Ford Racing C springs -
http://www.stangsuspension.com/store...?idproduct=259 They just barely lower the car, and have a nice firm spring rating... but still comfortable on the street. If you add some polyurethane spring isolators
http://www.stangsuspension.com/store...idCategory=111it will really not lower the car much at all.
2. Shocks & struts - if you really want to decrease body roll you will want a somewhat firm valving. You can try the Tokico D-specs
http://www.stangsuspension.com/store...?idproduct=600 These are an adjustable shock & strut kit, which can help you to fine tune the stiffness you want.
3. Swaybars - many aftermarket Mustang swaybars are thicker than your OEM swaybars and will help reduce body roll. Eibach makes a nice front& rear swaybar kit. The Eibach kit includes much stiffer front & rear bars, polyurethane pivot bushings, and polyurethane swaybar endlinks.
http://www.stangsuspension.com/store...?idproduct=285
Those 3 items should get you pretty far!
Sincerely,