SHO specific stuff I can think of:
-The ATX trannies suck. If you buy one and it hasn't been rebuilt, plan on doing it at some point in your ownership.
-The MTX trannies suck less. As long as the car isn't beaten on, the MTX will do just fine. Burnouts, speed shifting and dropping the clutch usually results in an ejected differential pin at some point.
-As with any car, see if there's any records of maintenance. Front and top 60k maintenance (timing belt, water pump, crank sensor, cam sensor, plugs, wires, valve clearance, re-sealing the valve covers) can get pricey if you have someone do it. Usually around 1200-1500 with parts and labor. Doing it yourself can save you a lot of money. You can get all the parts for well under 500. If this stuff hasn't been done, plan on doing it to have a reliable SHO. Most times, as with any car, neglect is the culprit.
-Rod bearings. Some consider them normal maintenance on an SHO with over or close to 100k. Parts are under $100, labor prices vary depending on rust, broken manifold studs when dropping the y-pipe, etc.
Other than the rod bearings, it's just a matter of responsible ownership, IE was the car owned by a snot nosed kid that left rubber at every stop light, or was it maintained and driven normally?
To be honest, with my sarcastic (often confused with douchy) disposition, I'd look for the cleanest rust free southern SHO on ebay, buy it, and drive it through the winter without washing it. Ever. Post pics.
