Mines got 168K on it and still runs great. I would see what maintinance info you can get from the seller. If it has been taken care of it should be solid.
DO you enjoy working on cars? If so, the sHO can be a very reliable and fun vehicle. If not, maintinace can be a little expensive. If I were looking at one to buy I would check the following:
1. Pull codes. Can be done with a paperclip, or on your test drive stop by Autozone ect. I believe they will pull codes for free.
2. Find out about maintinance. Pull a couple of the front plug wires and check for oil. If there is, the car could still be in good shape....just in need of some maintinance.
3. Look for signs of "spirited" driving. Ask about the performance nature of the car. If the seller starts talking about all the races he's won ect then the trans may be an issue.
Hope this helps
Jeremy