Borris:
Welcome to the club. This is definitely a project. I've been working on my project for the past 8 years, mainly because of money, and it's turning out nicely.
Okay, for the chassis and suspension, i would recommend the cage for that solid rigidness feel and personal safety. Suspension, JIC Coilovers or Tien Coilovers (my favorite) will do the trick; oh don't forget about the EDC if you go tracking. Other suspension. the upper and lower control arms are the same as the Toyota Supra TT. I don't really recommend the DIazen bushings kit because they squeak after a while; very annoying. I would recommend a ticket sway bar for the front. OEM is kind-off soft and I don't think it will hold up to high stress driving, if you're into that like i am.
The rear suspension should be the same as in the toyota Supra, and the differential should be open. Some LSD would be recommended.
Brakes. I went with Wilwood 14" discs with two channel calipers. There is a Brembo kit out there I would recommend that, and i would recommend changing the master cylinder as well. The OEM acted funny and leaked after three years of braking.
this should hopefully get you started with your research; I would check what some of the other members have done to their SCs. It's definitely a great car and great purchase, but since you've bought someone else's mess it going to be tough for a while.