Consider a 89-92 Cressida as well, same drivetrain as the NA Supra (albeit automagic only), got 3 stars driver, 4 stars passenger in the NHTSA's tests. Don't think the Supra will get any better than that. You'll save on insurance, and your weight is just about the same as an NA MKIII's, and definately lighter than the turbo's. Not sure how good the soop's bumpers are, but Cressida's big azz bumpers will protect you really nice in lower speed collisions. Yes, it's four doors, and yes, it's more boring, but it's just something you might want to consider.
Can't find crash stuff on the MKIII Supra

Don't know if they were ever tested.