Once the basics check out. It runs well...the paint is in good condition. Have a pre-purchase inspection done at a Toyota authorized shop. It generally should cost no more than a hours labor. Compression test is usually extra. If the car checks out, then you should atleast recoup the inspection cost in negotiating for the final price.
The 7M-GTE, inline 6 is a good engine but not as sturdy as Toyota 4 cylinders of the time. If you just want a nice car, not for speed. Avoid the Turbo. As even the normally aspirated Supra makes a healthy 200hp.
"Racing improves the breed" ~Sochiro Honda